Bridlewood Primary School Calculation and Croissant Parent Workshop 17 th October 2012

Bridlewood Primary School

Calculation and Croissant Parent Workshop

17th October 2012

Aims

To explain how we teach your children +, -, x and ÷.

To give you ideas of how you can help your children at home.

How did you solve these?

• 157+65=

• 245-152=

• 46x22=

• 154÷7=

Maths lessons

• Emphasis on mental calculation• Children are encouraged to work

mentally, using jottings to support their thinking

• Encouraged to use more formal written methods only for calculations they can not solve in their heads

• Maths through problem solving

By the end of Key Stage 2 we want your children to…

• Recall key number facts e.g all +/- facts for each number to 10, times tables, number bonds

• Have good understanding of the 4 operations

• Have an efficient, reliable method of calculation for each operation

• Apply what they know• Use a calculator effectively

Addition

Addition

Adding Practically

Addition

Encouraging childrento put the biggestnumber in their headand count on with fingers.

5 + 3

8

3 + 5

Use of a number line

1 2 3 4 5 6 7 8 9 10 11 12 13

Addition

6+5=

Use of a 100 square

34+12=

Partitioning

Addition by partitioning132+124=

Your Turn 56+43=

Addition using a blank number line

45+34=

Your Turn! 85+44

Addition

348+ 21 9 60 300 369

The Extended Method

Your turn - 266+233=

Addition- Standard Written Method

6648+1486=

We will extend further with larger numbers and decimals

Subtraction

Subtraction

3-2=

Taking away practically.

Use of a number line/100 square

12-6=6

1 2 3 4 5 6 7 8 9 10 11 12 13

Subtraction using a blank number line

62 – 26 =

Your turn! 78-44=

If the numbers are far apart, count back. If they are close together, count on.

Subtraction676 – 34 =

For this problem, you could also use this method:

654- 96

96 100 600 654

+4 +500 +54

500+54+4=558

600+ 70 + 6 30 + 4

600 + 40 + 2

Subtraction- Standard Written Method

6467-2684=

By year 6, the children will mostly be using the traditional borrowing method.

Multiplication

Reception

First of all, count in 2’s and then repeat by counting in 10’s.

Multiplication- repeated addition

xxxxx

3x5= (3 groups of 5)

xxxxx

xxxxx

5 + 5 + 5= 15

Times tables

• By end of Year 2 children should know x2,x5,x10

• Practise counting in 2’s, 3’s, 4’s, 5’s, 10’s

• Matching pairs (question on one card, answer on another)

• Musical times tables

Multiplication using a blank number line

4x3=

Your turn - 6x8=

Multiplication by partitioning

32x3=

Mentally solve this calculation by:

30 x 3 = 90 2 x 3 = 690 + 6 = 96

Your turn - 45x6=

Grid Method32x7=

33x22=

Your turn! - 34x23=

Multiplication-Standard Written Method

352x27=

352 x272464 (352x7)

7040 (352x20)

9504

13

1

1

Division ÷

Reception

• Sharing items equally into given groups

• 6÷2=

DivisionSharingThe children are sharing out into a known number ofgroups but how many in each group is unknown,

12÷3=

12 apples are shared into 3 baskets.How many apples are in each basket?

÷

Division – Y2 ÷

Division using a blank number line

25÷5= 5(How many groups of 5 are there in 25?)

÷Your turn - 24÷6

Division- Chunking

96÷6= Fact Box1x6=62x6=125x6=3010x6=6020x6=12050x6= 300100x6=600

(How many groups of 6 are there in 96?)

Your Turn!

Fact Box

1 x 9 = 9

2 x 9 = 18

5 x 9 = 45

10 x 9 = 90

20 x 9 = 180

50 x 9 = 450

100 x 9 = 900

522÷9=58

Long Division

• 105 ÷ 5

How you can support your child

• Look for and talk about numbers in the environment

• Play games• Shopping• Counting on/back• Number bonds• Doubles/Halves• Times tables• Division facts

Websites

• http://nrich.maths.org/public/• http://www.bbc.co.uk/schools/ks2bitesize/

maths/number.shtml• http://www.teachingtime.co.uk/• http://www.teachingtables.co.uk• http://www.bbc.co.uk/schools/laac/menu.shtml• http://www.woodlands-junior.kent.sch.uk/

interactive/literacy/index.htm• http://www.coxhoe.durham.sch.uk/