igsce maths subtracting using number line

1
subtracting two directed numbers
using a number line
2
in this lesson
we show how to subtract two numbers using a
number line
you also subtract two numbers using a number line
we shall subtract a positive number
3
full working
9 - 14
start at 9
move 14 steps to the left
9 - 14
- 5
answer from number line
subtraction count to the left
4
full working
7 - 12
start at 7
move 12 steps to the left
7 - 12
- 5
answer from number line
subtraction count to the left
5
lets do together
6
full working
-3 - 9
move 9 steps to the left
start at - 3
we are subtracting how many steps do we move and
in which direction?
where do we start from?
-3 - 9
- 12
answer from number line
where do we get the answer from?
subtraction count to the left
7
full working
-5 - 7
move 7 steps to the left
start at - 5
we are subtracting how many steps do we move and
in which direction?
where do we start from?
-5 - 7
- 12
answer from number line
where do we get the answer from?
subtraction count to the left
8
in the next exercise
you need
a number line
9
exercise
evaluate the following
1.
2.
3.
4.
5.
6.
10
answers
evaluate the following
1.
2.
3.
4.
5.
6.
11
full working
1.
start at 5
move 11 steps to the left
5 - 11
- 6
answer from number line
subtraction count to the left
12
full working
2.
start at 10
move 16 steps to the left
10 - 16
- 6
answer from number line
subtraction count to the left
13
full working
3.
start at -2
move 8 steps to the left
- 2 - 8
- 10
answer from number line
subtraction count to the left
14
full working
4.
start at - 7
move 4 steps to the left
- 7 - 4
- 11
answer from number line
subtraction count to the left
15
full working
5.
start at 8
move 15 steps to the left
8 - 15
- 7
answer from number line
subtraction count to the left
16
full working
6.
start at - 3
move 10 steps to the left
- 3 - 10
- 13
answer from number line
subtraction count to the left
17
summary
we showed how to subtract two numbers using a
number line
you also subtracted two numbers using a number
line
move 10 steps to the left
start at - 3
- 3 - 10
- 13
answer from number line
subtraction count to the left
18
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