igsce maths adding using a number line

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