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A SelectSmart.com Flowchart by year6boost
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help you decide what type of subtraction operation to use

               
Is the difference under 10?
NO
is the difference between 10 and 50
NO
Are all digits in the larger number higher than the lower number?
NO
Is there a zero in your number?
NO
go to the next box!

YES


YES


YES


YES


use fingers to count up from the smallest number
add- jump to the nearest 10, add multiples of 10, then keep jumping in 1's
easy column subtraction
Try using empty number line of expanded decomposition (eg 502-362)
Are there decimals?








YES

NO
 
 
 
Remember it's not just the columns that are the same, keep your decimal point in the same place!
Use expanded or column method!