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The Chimney Sum Strategy is when you write a sum like for example: 26 add 23 you would add both of the 2's and then add 6 add 3 but it can be any number for the sum. When you take away it is the same but you take the numbers away.

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The  Rounding and Compensation Strategy is when you times a number and whatever whole number it is closest to like for an example 3 x 22 ,22 is the closest to 20 then you write  3 times 20 and then 3 x 2 then you write the answer and add a 0 to the number then add a number.

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The Compensation Strategy is where you have to add and  round up a number and solve  the sum. And after  you can subtract the number and round that number.

subtraction:
41-25
40-25=15
15+1=16

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The split strategy is when you put the tens together and then the ones together and then you add it up and you work out what the answer is.