Addition and Subtraction can be solved by using two stratgies: counting on/back, rounding and compensating.
Counting on is adding forward using fingers, when the number is under ten. Counting back is subtracting uuing fingers, when the number subtraced is under ten.
Rounding and compensating is rounding the added or subtraced number to teh nearest tidy number, then compensating for teh rounding. Compensating is done by spliting teh new number into the old number and the leftover.
Counting on/back and rounding and compensating are easy stategies to use for addition and subtraction, when numbers get too big to solved with basic facts.
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