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Numbertime Addition and Subtraction, Addition And Subtraction: Plus and Minus Clips

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  1. Subtraction strategies

    Duration: 03:19

  2. Checking calculations using the inverse operation

    Duration: 03:05

  3. Subtracting tens and checking with the reverse operation

    Duration: 02:13

  4. Subtraction strategies

    Duration: 03:22

  5. Subtracting tens and checking with the reverse operation

    Duration: 02:17

  6. Checking calculations using the inverse operation

    Duration: 03:09