Addition and subtraction can be solved by using two stratagies: counting on/back, rounding and compensating.
Counting on is adding forward using fingers when the number is under ten. Counting back is subtracting backwards using fingers when the number subtracted is under ten
Rounding and compensating is rounding the subtracted number to the nearest tidy number, then compensating for ther rounding. Compensating is done by splitting the new number into the old number and the leftover
Counting on/back and rounding and compensating are easy stratagies to use for addition and subtraction, when numbers get to big to be solved with basic facts.
No comments:
Post a Comment
Note: only a member of this blog may post a comment.