igsce maths adding and subtracting negative and positive numbers

1
clean then add / subtract two directed numbers
using a number line
2
in this lesson
we show how to clean numbers
we use number line to add/ subtract the clean
numbers
you also clean numbers then
use number line to add/ subtract the clean numbers
3
cleaning numbers
recall from our first lesson that
9
9

number
number
1.
2.
3.
if there is a minus
change sign
4.
4
cleaning numbers
gives
same signs
positive
ssp
gives
different signs
negative
dsm
gives
gives
subtraction
6 - 10
6-10
addition
5
meaning of
see multiplication of negative number by negative
number
6
examples
start at - 4
move 12 steps to the right
answer from number line
addition count to the right
7
examples
move 14 steps to the left
start at 6
answer from number line
subtraction count to the left
8
in the next exercise
you need
a number line
9
exercises
evaluate the following
1.
2.
3.
4.
5.
6.
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answers
evaluate the following
1.
2.
3.
4.
5.
6.
11
examples
1.
start at - 7
move 8 steps to the right
answer from number line
addition count to the right
12
examples
2.
start at - 6
move 13 steps to the right
answer from number line
addition count to the right
13
examples
3.
move 11 steps to the left
start at 10
answer from number line
subtraction count to the left
14
examples
4.
move 8 steps to the left
start at 7
answer from number line
subtraction count to the left
15
examples
5.
move 12 steps to the left
start at - 1
answer from number line
subtraction count to the left
16
examples
6.
start at - 5
move 13 steps to the right
answer from number line
addition count to the right
17
summary
we showed how to clean numbers
we used number line to add/ subtract the clean
numbers
you also cleaned numbers then
used number line to add/ subtract the clean
numbers
cleaning numbers
ssp
positive
same signs
gives
gives
different signs
negative
dsm
gives
gives
18
more free maths lessons
at
igscemaths24.thinkific.com
19
cleaning numbers
1.
2.
3.
4.