Lesson 7

WHAT IS SUBTRACTION?

Objectives

After this lesson, the students are expected to:

define what is subtraction; identify the parts in subtraction; differentiate the subtraction from addition.

What is Subtraction?

After learning and describing addition as a

process of combining two or more groups of objects, we

can now consider its opposite operation --- Subtraction.

If addition is combining of group of object, subtraction is

the process of taking away or of removing something.

The symbol used for subtraction is the minus sign (-).

When we write 12 – 6, we wish to subtract 6 from 12 or to take away

6 from 12. To find the difference between two numbers, we have to look for

a number which when added to the subtrahend, will give the minuend. The

table shows the relation between addition and subtraction. One undoes the

work of the other.

Let us consider the notation below.

12 addend

+ 6 addend

18 sum Minuend 18

Subtrahend - 6

Difference 12

Difficulties may arise in subtraction when a digit of the subtrahend is larger than the corresponding digit in the minuend. The process of doing a subtraction of this type is called barrowing or regrouping

WORKSHEET NO. 7

NAME: ___________________________________ DATE: _____________

YEAR & SECTION: ________________________ RATING: ___________

A. Give the meaning of the following words.

1. Subtraction-________________________________________________

2. Minuend-__________________________________________________

3. Subtrahend-________________________________________________

4. Difference-_________________________________________________

B. Name the following parts of the mathematical expression given below.

12638 _____

- 3630 _____

___ 9008

D. Solve the following to get the difference

1. 5637584-43675=________________

2. 5389-782=_____________________

3. 43674-768=____________________

4. 376598-5281=__________________

5. 67396-683=____________________

6. 57290-7849=___________________

7. 56284-6847=___________________

8. 683963-68363=_________________

9. 6254-978=_____________________

10. 654-87=______________________

3. 5428

-2001

4. 10,000

-6,543

2. 1243

-360

1. 349

-265

C. Find the difference

WRITE YOUR SOLUTION HERE: