"Success is not final, failure is not fatal; it is the courage to continue that counts." - Winston Churchill
Add/Sub is addition and subtraction.
Maths Playground Games
This page has lots of games to practice your addition and subtraction skills. You can practice your basci facts or extend yourself by mentally adding and subtracting up to 100.
Addition algorithms
Watch this video to learn how to do addition algorithims.
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Subtraction algorithms
Watch this video to learn how to do subtraction algorithms.