1. Negative
Numbers

2. 1 2 3 4 5 6 7 8 9 10 + We can think of numbers being on a number line:1 2 3 4 5 6 7 8 9 10
These numbers are all positive numbers. +

3. The number line can also continue on past 0:
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10
These new numbers are negative numbers. -

4. What is -3 plus 5? -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10
We can use our number lines to work out the sums which include negative numbers.
What is -3 plus 5?
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10
First we locate -3 on the number line.
We start at -3

5. What is -3 plus 5? -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10
We can use our number lines to work out the sums which include negative numbers.
What is -3 plus 5?
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10
We start at -3

6. What is -3 plus 5? -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10
We can use our number lines to work out the sums which include negative numbers.
What is -3 plus 5?
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 =2
Next we count on 5 places to the right.
We start at -3
After 5 jumps we arrive at 2

7. Now try this one:
What is -1 plus 3
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10

8. Now try this one:
What is -1 plus 3
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8 9 10 =2