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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!