Addition and Subtraction can be solved by using two stategies: counting on/back, rounding and compensating.
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 compensating is rounding the added or subtrated number to the nearest tidy number, then compensating for the rounding. Compensating is done by slitting the new number into the old number and the leftover.
Counting on/back and rounding and compensating is easy stategies to use addition and subtraction, when numbers get too big to be solved with basic facts.
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