Adittion and subtraction can be solved by using two stratefieas: counting on/back, rounding and compensating.
Counting on is adding forward using figure when the number is under ten. Counting back is subtracting usig fingers, when the number subtracded is under ten.
Rounding and compensating is rounding the added or subtracted number to the nearest tidy numbe, then compensating for the rounding. Compenstating is done by spitting the new number into the old number and the leftover.
Counting on/back and rounding and compenstating are easy strageis to use for addition and subtraction, when numbers et too big to be solved with basic facts.
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