In this video, I explain how to perform two-digit operations quickly using mental strategies. We'll cover **addition**, ...

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I probably could have guessed that. What an interesting shop. NARRATOR: That’s a good idea, Fin. Arrange your credits into stacks of 10 to make them easier to count. 1 stack of 10… 2 stacks of 10.

You can add or subtract numbers in lots of different ways. You can use number lines, number bonds, fact families, 10 squares and counters, or even just writing the numbers down. Sometimes it is faster ...