Mental Math 2

Mental Math2

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New Edition, 2020

Printed in India by Shikshan Books & Stationery Pvt. Ltd, Mumbai

Published by Shikshan Books & Stationery Pvt. Ltd, Mumbai

Publisher’s NoteEducation aims at the holistic development of a child and prepares the children of today for the challenges of tomorrow. It is a socially oriented activity. Being so, it plays a vital role in building the society. It aims to foster peace, humanness, tolerance and an inclusive outlook among children to live in a multicultural society. Education, therefore, is vital in promoting and nourishing a wide range of skills and capacities in children.

The textbook adheres to the latest curricular guidelines. The language of the textbook is simple, lucid and comprehensible. The content is age-appropriate and well-supported by illustrations, diagrams, maps and quizzes. Utmost emphasis has been given on the recent trends in teaching-learning of the subject. The book has been creatively designed to connect the children to their immediate environment. It provides scope to make learning a joyful experience by moving away from rote learning and giving children opportunities to learn by actively participating in hands-on-experiments. The exercises provide ample scope to assess children on different kinds of skill sets. Principles of critical pedagogy overarch the textbook so that a scientific temper and a scientific outlook develop in the students as the necessary learning outcome.

We have taken a special effort to ensure that the textbook is free from any bias and presents an accurate view of the topics covered.

We welcome valuable suggestions for improvement of the textbook.

Mumbai Publisher

01 January 2020

Pledge

“India is my country.

All Indians are my brothers and sisters.

I love my country and I am proud of its rich and varied heritage.

I shall always strive to be worthy of it.

I shall give my parents, teachers and all elders respect

and treat everyone with courtesy.

To my country and my people, I pledge my devotion.

In their well being and prosperity alone, lies my happiness.”

Content

Chapter Number Name of the Chapter Page

Number

1 Numbers up to 999 1-6

2 Enjoy with Numbers 7-12

3 Addition 13-17

4 Subtraction 18-22

5 Shapes 23-26

6 Patterns 27-29

7 Multiplication 30-34

8 Division 35-37

9 Measurement 38-42

10 Time 43-46

11 Money 47-50

12 Data Handling 51-52

PB 1

Section 1.1Convert the following.

Date:- / /

a. 7 hundreds = tens

b. 4 hundreds = ones

c. 1 hundred = tens

d. 6 hundreds = ones

e. 9 hundreds = ones

Teacher’s Sign: Remark:

Section 1.2Tick the correct box.

Date:- / /

a. Nine hundred seventy-four: 794 974

b. Number name for 660: six hundred sixty six hundred sixteen

c. 705 can be written as: seven hundred five five hundred seven

d. Eight hundred three: 830 803

e. 523 in words: five hundred twenty-three five twenty three


Numbers up to 9991

2 3

Section 1.3Count and write.

Date:- / /

a.

b.

c.

d.

e.


2 3

Section 1.4Circle the correct number represented on the abacus.

Date:- / /

a. 165 156

b. 457 754

c. 951 519

d. 632 623

e. 374 347


4 5

Section 1.5Fill in the missing numbers.

Date:- / /

a. 632 634 636 637

b. 900 901 902 903

c. 270 271 273 275

d. 513 514 517 518

e. 379 380 381 382


Section 1.6Identify the number.

Date:- / /

a. 8 hundreds is same as

b. I am the smallest 3-digit number.

c. I am the greatest 3-digit number. d. I am a number between 765 and 775; I have 3 as one of the

digit.

e. I am a number between 290 and 310; I can be counted in hundreds.


4 5

Section 1.7Write the place value of the underlined digit.

Date:- / /

a. 716

b. 483

c. 350

d. 271

e. 608


Section 1.8Write the standard form/ expanded form.

Date:- / /

a. 570 = hundreds + tens + ones

b. 771 = hundreds + tens + ones

c. 4 hundreds + 6 tens + 5 ones =

d. 934 = hundreds + tens + ones

e. 2 hundreds + 0 tens + 1 one =


6 PB

Section 1.9Round off the given numbers to the nearest tens.

Date:- / /

a. 42

b. 58

c. 63

d. 77

e. 86


Section 1.10Answer the following.

Date:- / /

a. How many tens are there in 3 hundreds?

b. In the number 564, the digit 5 is at which place?

c. What is the face value of digit 9 in 293?

d. What is the standard form of 7 hundreds + 3 tens + 6 ones?

e. How many ones are there in 248?


PB 7

Section 2.1Count forward or backward.

Date:- / /

a. 615, 616, , , ,

b. 421, 422, , , ,

c. 998, 997, , , ,

d. 730, 731, , , ,

e. 253, 252, , , ,


Section 2.2Write the numbers before, after or in between.

Date:- / /

a. 265

b. 621

c. 981 983

d. 357

e. 792 794


Enjoy with Numbers2

8 9

Section 2.3Write the number 1 more than or 1 less than.

Date:- / /

a. 1 more than 998

b. 1 less than 600

c. 1 less than 450

d. 1 more than 569

e. 1 less than 315



Date:- / /

a. 10 less than 678

b. 10 more than 899

c. 10 less than 759

d. 10 more than 467

e. 10 less than 361


8 9


Date:- / /

a. 100 more than 45

b. 100 more than 756

c. 100 less than 698

d. 100 more than 175

e. 100 less than 216


Section 2.6Put the correct sign (‘>’, ‘<’ or ‘=’)

Date:- / /

a. 718 178

b. 607 601

c. 432 432

d. 991 997

e. 532 325


10 11

Section 2.7Write the greatest and the smallest number.

Date:- / /

Numbers Greatest Number Smallest Number

a. 625, 635, 665

b. 832, 361, 489

c. 912, 921, 901

d. 975, 974, 972

e. 652, 562, 526


Section 2.8Form the greatest or the smallest 3-digit number using the given digits.

Date:- / /

a. Greatest number using 1, 5, 3:

b. Smallest number using 7, 6, 2:

c. Greatest number using 4, 9, 8:

d. Smallest number using 3, 9, 7:

e. Greatest number using 2, 4, 5:


10 11

Section 2.9Write ‘A’ for ascending order and ‘D’ for descending order.

Date:- / /

a. 794, 776, 753, 711

b. 113, 140, 167, 193

c. 122, 212, 234, 282

d. 781, 766, 649, 618

e. 887, 861, 854, 823


Section 2.10Write even or odd.

Date:- / /

a. 547

b. 698

c. 230

d. 125

e. 789


12 PB

Section 2.11Write cardinal or ordinal number or number name.

Date:- / /

a. In the word “SUCCESS” the letter ‘E’ is in the position.

b. Ordinal number name of 11th

c. Cardinal number of seventeenth

d. Ordinal number name of 19 th

e. Cardinal number name of third



Date:- / /

a. What is the number in between 235 and 237?

b. Identify the number which is 10 more than 428.

c. Which one is smaller: 975 or 957?

d. Identify the number 326 as even or odd.

e. What is the ordinal number name for 15th?


PB 13

Section 3.1Adding 0

Date:- / /

a. 415 + 0 =

b. 526 + 0 =

c. + 995 = 995

d. 627 plus 0 is equal to .

e. What will we get if we add 0 to 283?


Section 3.2Adding 1

Date:- / /

a. 359 + 1 =

b. 726 + 1 =

c. 275 plus 1 is equal to .

d. 4 hundreds + 3 tens + 9 ones and 1 one =

e. What do we add to 899 to get 900 ?


Addition3

14 15

Section 3.3Order in addition

Date:- / /

a. 500 + 200 = 200 +

b. + 350 = 350 + 150

c. 231 + = 145 + 231

d. + 320 = 455 + 320

e. 610 + 210 = + 610


Section 3.4Add two 2-digit numbers.

Date:- / /

a. 13 + 10 =

b. 45 + 15 =

c. What is the sum of 52 and 28?

d. sixty-one + thirty-four =

e. 9 tens and 4 ones + 6 tens =


14 15

Section 3.5Add a 3-digit number with a 2-digit number.

Date:- / /

a. 623 + 46 =

b. 730 + 68 =


d. What is the sum of 417 and 60?

e. What will we get when we add 53 to 225?


Section 3.6Add two 3-digit numbers.

Date:- / /

a. 326 + 452 =

b. 624 + 160 =


d. What is the sum of 835 and 164?

e. What will we get if we add 272 to 410?


16 17

Section 3.7Add three 2-digit numbers.

Date:- / /

a. 35 + 24 + 11 =

b. 52 + 17 + 30 =

c. 61 + 32 + 15 =

d. What is the sum of 46, 14 and 20?

e. What will we get when we add 40, 30 and 12?


Section 3.8Add the following.

Date:- / /

a. + 1 = 200

b. five hundred + three hundred =

c. 20 + 7 + 11 =

d. Sum of 76 and 12 is .

e. 254 plus 32 is equal to .


16 17

Section 3.9Answer the following questions.

Date:- / /

a. A fruit seller has 24 mangoes. Another fruit seller has 35 mangoes. How many mangoes are there in all?

So, there are mangoes in all.

b. I have 25 sweets with me. Mother gave me 14 more sweets. How many sweets do I have in all?

So, I have sweets in all.

c. A balloon seller has 37 red balloons and 12 blue balloons. How many balloons does he have in all?

So, he has balloons in all.

d. A florist has 32 red roses and 45 white roses. How many roses are there in all?

So, there are roses in all.

e. In a zoo, there are 40 monkeys and 18 zebras. How many animals are there in the zoo?

So, there are animals in the zoo.


18 19

Section 4.1Subtracting 0

Date:- / /

a. 52 − 0 =

b. − 0 = 134

c. 294 minus 0 is equal to .

d. minus zero give us 903.

e. If we take away 0 from 84, we get .


Section 4.2Subtracting 1

Date:- / /

a. 410 − 1 =

b. − 1 = 817


d. minus 1 gives us 871.

e. If we take away 1 from 60, we get .


Subtraction 4

18 19

Section 4.3Subtracting a number from itself

Date:- / /

a. 67 − 67 =

b. 468 − = 0


d. What will we subtract from 183 to get 0?

e. If we subtract 72 from 72, we get .


Section 4.4Subtract a 1-digit number from a 2-digit number.

Date:- / /

a. 17 − 5 =

b. 29 − 6 =


d. 2 less than 84 is .



20 21

Section 4.5Subtract two 2-digit numbers.

Date:- / /

a. 48 − 21 =

b. 28 − 10 =

c. 5 tens and 7 ones − 1 ten and 5 ones =

d. 68 minus 34 is equal to .



Section 4.6Subtract a 2-digit number from a 3-digit number.

Date:- / /

a. 576 − 62 =

b. 764 − 30 =

c. 689 − 5 tens and 9 ones =

d. 897 minus 65 is equal to .



20 21

Section 4.7Subtract two 3-digit numbers.

Date:- / /

a. 485 − 162 =

b. 976 − 643 =


d. What is the difference between 678 and 236?

e. What will we get if we subtract 621 from 847?


Section 4.8Subtract the following.

Date:- / /

a. Seventy minus thirty is .

b. 320 − = 310

c. 918 – 918 =

d. Difference between 179 and 65 is .

e. 511 minus 211 is equal to .


22 PB


Date:- / /

a. There were 26 birds on a tree. 5 flew away. How many birds are left on the tree?

So, there are birds left on the tree.

b. Mother had 17 bangles. She gave 12 of them to Granny. How many bangles are left with her?

So, bangles are left with her.

c. There were 60 seats in an auditorium. 20 seats were empty. How many seats were full?

So, seats were full.

d. There were 33 flowers in a garden. Out of which 15 were red. How many flowers were not red?

So, flowers were not red.

e. Ruhi had 55 chocolates. She gave 45 chocolates to her friends. How many chocolates are left with her?

So, chocolates are left with Ruhi.


PB 23

Section 5.1Tick the correct option and fill in the boxes.

Date:- / /

a. A square has corners. (3/ 4)

b. Only the opposite sides of a are equal. (rectangle/ square)

c. A has 3 sides and 3 corners. (circle/ triangle)

d. A circle has side/sides. (0/ 1)

e. An oval has corner/corners. (0/ 2)


Section 5.2Fill in the boxes.

Date:- / /

a. A cuboid has vertices.

b. A sphere has one face.

c. A cylinder has flat faces and curved face.

d. A cube has vertices and edges.

e. A cone has vertices and curved face.


Shapes 5

24 25

Section 5.3Write the name of the 2D shape that you will get when you trace the outline of the flat face of the following 3D objects.

Date:- / /

a. b. c.

d. e.


Section 5.4Circle the odd one out.

Date:- / /

a. birthday cap note book ice cream cone

b. pencil box duster globe

c. pen marble ball

d. felt pen glass matchbox

e. cold drink can dice ice cube


24 25

Section 5.5Curved or straight lines

Date:- / /

a. A ball is made up of lines.

b. A duster is made up of lines.

c. The letter ‘ ’ is made up of straight as well as curved lines.

d. The letter ‘A’ is made up of lines only.

e. The letter ‘ ’ is made up of curved lines only.


Section 5.6Choose the correct alternatives.

Date:- / /

a. Ice-cream cone: slide roll slide and roll

b. Gift box: slide roll slide and roll

c. Ball: slide roll slide and roll

d. Chocolate bar: slide roll slide and roll

e. Flute: slide roll slide and roll


26 PB

Section 5.7Match the following.

Date:- / /


PB 27

Section 6.1Draw and complete the pattern.

Date:- / /

a.

b.

c.

d.

e.


Section 6.2Write the next two numbers in the pattern.

Date:- / /

a. 11, 22, 11, 22, ,

b. 8, 16, 24, ,

c. 90, 80, 70, ,

d. 25, 30, 35, ,

e. 35, 28, 21, ,


Patterns 6

28 29

Section 6.3Tick () the alternative which will come next.

Date:- / /

a.

b.

c.

d.

e.


28 29

Section 6.4Circle what will come next.

Date:- / /

a.

b.

c.

d.

e.


30 31

Section 7.1Write the addition statement for the following.

Date:- / /

a. 7 groups of 5 each =

b. 2 groups of 3 each =

c. 9 × 4 =

d. 1 group of 8 each =

e. 10 × 6 =


Section 7.2Write the multiplication fact for the following.

Date:- / /

a. 3 times 7 = ×

b. 5 + 5 + 5 + 5 = ×

c. 9 times 5 = ×

d. 10 + 10 + 10 = ×

e. 2 times 4 = ×


Multiplication7

30 31

Section 7.3Multiply by 0

Date:- / /

a. 9 times 0 =

b. × 35 = 0

c. 15 groups of 0 = × =

d. 11 times 0 =

e. 98 × = 0


Section 7.4Multiply by 1

Date:- / /

a. × 1 = 67

b. 8 times 1 = × =

c. 1 × 46 =

d. 1 times 24 =

e. 87 × = 87


32 33

Section 7.5Order in Multiplication

Date:- / /

a. × 6 = × 7 = 42

b. 8 × 4 = × = 32

c. 3 × 5 = × 3 =

d. 2 times 10 = times 2 =

e. 9 × = 6 × = 54


Section 7.6Skip count and fill in the boxes.

Date:- / /

a. 3 6 15 18

b. 14 21 28 42

c. 5 10 15 20 35

d. 9 27 36 45

e. 6 18 24 36


32 33

Section 7.7Fill in the blanks.

Date:- / /

a. 8 times 2 =

b. 7 × = 35

c. × 6 = 48

d. 5 multiplied by 4 =

e. 9 × = 27


Section 7.8Multiply the following.

Date:- / /

a. 21 × 2 =

b. 30 × 3 =

c. 25 × 5 =

d. 42 × 4 =

e. 13 × 8 =


34 PB


Date:- / /

a. A basket has 9 apples. How many apples are there in 8 such baskets?

So, there are apples in 8 such baskets.

b. A candle box has 8 candles. How many candles are there in 7 such boxes?

So, there are candles in 7 such boxes.

c. There are 5 groups of 5 flowers each. How many flowers are there in all?

So, there are flowers in all.

d. A hen lays 6 eggs in a day. How many eggs will it lay in 4 days?

So, the hen lays eggs in 4 days.

e. A tray has 10 pastries. How many pastries are there in 4 such trays?

So, there are pastries in 4 such trays.


PB 35

Section 8.1Write the division fact for the given multiplication fact.

Date:- / /

a. 9 times 3 = 27

b. 8 × 7 = 56

c. 6 × 6 = 36

d. 4 × 5 = 20

e. 7 multiply by 10 = 70


Section 8.2Write the multiplication fact for the given division fact.

Date:- / /

a. 64 divide by 8 = 8

b. 72 ÷ 8 = 9

c. 20 ÷ 10 = 2

d. 45 divide by 9 = 5

e. 96 ÷ 3 = 32


Division8

36 37

Section 8.3Divide by 1

Date:- / /

a. 78 ÷ = 78

b. 53 ÷ = 53

c. ÷ 1 = 46

d. 20 divide by 1 =

e. 91 divide by = 91


Section 8.4Divide by itself

Date:- / /

a. 35 ÷ 35 =

b. 84 ÷ 84 =

c. 26 ÷ = 1

d. divide by 97 gives 1.

e. 49 divide by 49 is .


36 37

Section 8.5Fill in the boxes.

Date:- / /

a. 30 ÷ = 6

b. 49 ÷ 7 =

c. 28 ÷ = 7

d. 69 divide by 3 =

e. 6 divide by = 6



Date:- / /

Division fact: 54 ÷ 9 = 6

a. Dividend:

b. Divisor:

c. Quotient:

d. Multiplication fact:

e. Repeated subtraction fact:


38 39

Section 9.1Write the correct unit of measuring length.

Date:- / /

a. Length of your classroom

b. Length of a sofa

c. Length of a pencil

d. Length of a book

e. Length of a car


Section 9.2Guess the length of the given objects. Measure it using an eraser.

Date:- / /

Object Estimated length Actual length

a. Pencil

b. Math notebook

c. Pencil box

d. Ruler

e. Crayon


Measurement9

38 39

Section 9.3Write the correct unit for measuring the weight of

Date:- / /


Section 9.4Tick the heavier object.

Date:- / /

a. an elephant a lion

b. a feather a mango

c. a balloon a book

d. a bread loaf a marble

e. a necklace a flower


40 41

Section 9.5Write the correct unit to measure the capacity of

Date:- / /

WATER


Section 9.6Number the containers (1-3) from the least to greatest capacity.

Date:- / /

a.

b.


40 41

Section 9.7Match the tools to the objects.

Date:- / /


42 PB

Section 9.8Look at the containers given below. Estimate whether they have same capacity or different capacity. Tick () ‘Yes’ for same, ‘No’ for different and ‘Almost’ for almost same capacity.

Date:- / /

a.

Yes No Almost

b.

Yes No Almost

c.

Yes No Almost

d.

Yes No Almost


PB 43

Section 10.1Write the time shown in the clock in two ways.

Date:- / /

a.

b.

c.

d.

e.


Time10

44 45

Section 10.2Tick () the activity which takes an hour and cross () the activity which takes hours.

Date:- / /

a.

Painting a picture

Painting walls of a house

b.

Playing a lawn tennis match

Doing aerobics


44 45

Section 10.3Tick () the activity which takes a day and cross () the activity which takes days.

Date:- / /

a.

Going from Mumbai to Kolkata by train

Going from Mumbai to U.S.A by aeroplane

b.

Visit to an aquarium

Going on a holiday


46 PB

Section 10.4Fill in the boxes with the correct days of the week.

Date:- / /

Monday Wednesday

Friday


Section 10.5State true or false.

Date:- / /

a. December has 30 days.

b. The fourth month of the year is March.

c. October comes before November.

d. February can either have 28 or 29 days.

e. There are 11 months in a year.


PB 47

Section 11.1Count and write.

Date:- / /

a. `

b.

`

c. `

d. `

e.

`


Money11

48 49

Section 11.2Fill in the blanks with the correct number.

Date:- / /

a. notes of ` 10 make ` 50.

b. coins of ` 5 make ` 50.

c. coins of ` 1 make ` 50.

d. note of ` 20 and notes of ` 10 together make ` 50.


Section 11.3Identify the correct amount given.

Date:- / /

a. Ninety-two rupees is written as:

` 92 ` 97

b. ` 86 is written in words as:

eighty-six rupees sixty-eight rupees

c. Thirty rupees is written as:

` 3 ` 30

d. ` 62 is written in words as:

sixty-five rupees sixty-two rupees

e. ` 24 is written in words as:

twenty-four rupees forty-two rupees


48 49

Section 11.4Put the correct sign (>, <, =)

Date:- / /

a.

b.

c.

d.

e.


50 PB

Section 11.5Add the following.

Date:- / /

a. nine rupees + seven rupees =

b. ` 67 + ` 21 =

c. ` 54 + ` 15 =

d. ` 42 + ` 36 =

e. thirty-five rupees + forty rupees =


Section 11.6Subtract the following.

Date:- / /

a. ` 98 – ` 45 =

b. sixty-five rupees – twenty-one rupees =

c. ` 87 – ` 53 =

d. seventy-nine rupees – thirty-four rupees =

e. ` 56 – ` 10 =


PB 51

Section 12.1Count the following and answer the questions given below.

Date:- / /

Letter of alphabet

Number of letters

a. How many C’s are there?

b. Which letter is the least in number?

c. Count the total number of letters ‘A’ and ‘D’.

d. How many more B’s are there than E’s?

e. Find the total number of letters.


Data Handling 12

52 PB

Section 12.2Study the pictograph and answer the questions given below.

Date:- / /

Various activities Number of children who took these activities

Dance Music

Art and Craft Clay moulding

Yoga Each stands for 5 students

a. Which is the most popular activity?

b. Which is the least popular activity?

c. How many students took up dance?

d. How many more students took art and craft activity than clay moulding?

e. How many students took up yoga?

f. Count the total number of students.


Documents

Mental Math 2