Integers - Mathematics Form 1
ADDITION AND SUBTRACTION OF INTEGERS
Numbers - whole numbers and integers.
a). Which of the following are whole numbers?
- 3, 3, 0.55, 102, 6, 9, -1.5, 0, -6
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
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:
b) -1, 4
c) 0, -3
d) 3, 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)
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 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.
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