Addtion and Subtraction can be solved by using two strategies: counting on/back, rounding and compansating.
Counting on is adding forward using fingers when the number added is under ten. Counting back is subtracting using fingers, when the number subtracted is under ten.
Rounding and compansating is rounding the added or subtraction number to the nearest tidy number, then compansating. Compansating is done by spliting the new number into the old number and the leftover.
Counting on/back and rounding and compansating are easy strategies to use for addtion and subtraction, when numbers get too big to be solved with basic facts.
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