Addition and Subtraction can be solved by using strategies: counting on/back rounding and compesating.
Counting on is adding forward using fingers when the added is under ten. Counting is subtracting using fingers when the subtracted is under ten.
Rounding and compesating is rounding is added or subtracted number to the nearest tidy number, then compesating for rounding. Compesating is done by splitting the new number into the old number and leftover
Countingon/back and rounding and compesating are easy stragegies to use for addition and subtration,when get too big to be solved with basic facts.
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