1. Positive and Negative Numbers
The Number Line. -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8
Look at the number line above.
What numbers go before the zero?
We are now going to use the number line to carry out some calculations.

2. Adding and Subtracting.1 2 3 4 5 6 7 8 -1 -2 -3 -4 -5 -6 -7
We are going to use the number line above to calculate the sum below:
6 – 10 =
(1) Start at the number 6
(2) To subtract go left from 6.
(3) Move 10 left.
(4) Now answer the question
6 – 10 = -4

3. Adding & Subtracting Example.1 2 3 4 5 6 7 8 -1 -2 -3 -4 -5 -6 -7
Now calculate: = -3
(1) At what number do you start?
(2) To add do you move left or right?
right
(3) How many squares do you move? 7
(4) The answer to the sum
= is? 4

4. Adding & Subtracting Example.1 2 3 4 5 6 7 8 -1 -2 -3 -4 -5 -6 -7
Calculate
– 2 – 3 =
At what number do you start?
How many steps do you move?
Now complete the sum :
– 2 – 3 = -5

5. What Goes In The Box ? Complete the questions below yourself:
(1) 6 – 8 = -2
(6) 7 – 12 = -5
(2) – = 4
(7) – = 5
(3) – = 2
(8) – =
(4) –4 + 8 = 4
(9) – 2 – 5 = -7
(10) – – 8 = -3
(5) –1 – 6 = -7

6. What Goes In The Box ? 2
Complete these questions using a bigger number line if required:
- 48
(1) 12 – 16 = -4
(6) 72 – 120 =
(2) – = -6
(7) – = 18
(3) – = 8
(8) – =
-10
(4) – = 14
(9) – 42 – 57 =
-99
-45
(10) – – 89 =
(5) –18 – 52 =
-70

7. What goes In The Box ? 3
Work backwards here to work out the missing numbers.
(1) – = 12 18
(2) = – 3
-13
(3) 12 – = – 22 34
(4) – = – 25
-11
(5) 22 – = – 17 39