## Integers

ADDITION AND SUBTRACTION OF INTEGERS

BACKGROUND KNOWLEDGE

Numbers - whole numbers and integers.

a). Which of the following are whole numbers?

- 3, 3, 0.55, 102, 6, 9, -1.5, 0, -6

Solution

The whole numbers are -3,3, 102, 6, 9, -6 and 0

b). Identify the integers represented by the letters a, b, c and d

ADDITION AND SUBTRACTION OF INTEGERS

BACKGROUND KNOWLEDGE

Numbers - whole numbers and integers.

a). Which of the following are whole numbers?

- 3, 3, 0.55, 102, 6, 9, -1.5, 0, -6

**Solution **

**The whole numbers are -3,3, 102, 6, 9, -6 and 0**

b). Identify the integers represented by the letters a, b, c and d

Solution

a is 3, b is -1, c is -2, d is -4

Note: On the number line, numbers are marked at unit integers, that is, equal single steps increasing from zero (0) to the right.

The arrow head shows the direction in which the numbers increase or decrease.

The left of zero (0) on a number line are negative numbers.

If the two numbers on a number line are taken, the one to the right is
the greater one.

Note: -3 is less that -2 and 5 is less than 6

1.Choose the greater number in each of the following pairs:

a) -7,-2

b) -1, 4

c) 0, -3

d) 3, 8

Solutions

a) -2

b) 4

c) 0

d) 8

2. Addition and subtraction of whole numbers

**
Practice
Exercise
worked out examples **

**
Observe
carefully how these are worked out **

Work out the following using a number line

a). (+2) + (+5)

b). (+2) + (+2) + (+1)

d). (-5) + (+2)

e). (-6) + (+2) + (+4)

Lesson objective

#### By the end of this lesson you should be able to

:add integers using numberline correctly

subtract integers using number line correctly

Addition of Integers

Brackets

Brackets should be used around negative numbers to separate the minus sign attached to the number from the arithmetic operation symbol.for example, 5 - -3 should be written as 5 -(-3) and 7 x -2 should be written as 7 x (-2).

Note :Never write two arithmetic operations symbols together without using brackets.

Integers

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Integers

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