Addition and Subtraction can be solved by using two stratiegies counting on/back, rounding and compensating.
Counting on is adding forward using finger's when the number is under 10. Counting backward is subtracting number under 10 with your finger's.
Rounding and compensating is rounding the added or subtarcting number to the nerest tidy number, then compensating for the rounding. Compensating is done by splitting the new number into the old number and the left over.
Counting on/back and rounding and compensting are easy strartiegies for addition and subtraction, when numbers get to be big to be solved with basic fact.
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