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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