igsce maths adding and usbtracting positive and negative numbers 2

1
clean add/ subtract two directed numbers
using a number line
2
in this lesson
we show how to clean numbers including bracket
removal
we use number line to add/ subtract the clean
numbers
you also clean numbers including removing
brackets then
use number line to add/ subtract the clean numbers
3
cleaning numbers
gives
same signs
positive
ssp
gives
different signs
negative
dsn
gives
gives
subtraction
addition
6 - 10
6-10
4
examples
move 12 steps to the right
start at - 4
answer from number line
addition count to the right
5
examples
move 11 steps to the left
start at - 2
answer from number line
subtraction count to the left
6
in the next exercise
you need
a number line
7
exercises
evaluate the following
1.
2.
3.
4.
5.
6.
8
answers
we evaluated the following
1.
2.
3.
4.
5.
6.
9
working
1.
move 3 steps to the right
start at 7
answer from number line
addition count to the right
10
working
2.
move 13 steps to the right
start at - 5
answer from number line
addition count to the right
11
working
3.
move 7 steps to the left
start at 1
answer from number line
subtraction count to the left
12
working
4.
move 4 steps to the left
start at -2
answer from number line
subtraction count to the left
13
working
5.
move 9 steps to the right
start at - 4
answer from number line
addition count to the right
14
working
6.
move 19 steps to the left
start at 9
answer from number line
subtraction count to the left
15
summary
we showed how to clean numbers including bracket
removal
we used number line to add/ subtract the clean
numbers
you also cleaned numbers including removing
brackets then
used number line to add/ subtract the clean
numbers
cleaning numbers
ssp
positive
same signs
gives
gives
different signs
negative
dsn
gives
gives
16
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