Addition and subtraction strategies

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Addition and subtraction
strategies
Place Value
How to use this strategy
537+245=
500+200=700
30+40=70
7+5=12
700+70+12=782
answer 782
Rounding and compensating
137+58=
58+2=60
137-2=135
60+135=195
answer 195
Number line
Long addition
What to do
Subtracting in part’s
What to do
Subtract the smaller number in parts eg
divide the number 54 into 30, 20 and 4.
96-54=
96-30=66
66-20=46
46-4=42
answer 42
Changing subtraction into addition
What to do
Change the number into a addition like I have
done here. Then in parts plus on how many it
takes from the smaller number to get to the bigger
number . That will give you your answer.
123-96=
96+ =123
96+4=100
100+23=123
4+23=27
answer 27
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