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1st grade

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I don't know how to do this.. I don't understand it. Use | and . to show the number 42

  • 1st grade - ,

    ||||..

  • 1st grade - ,

    42

  • 1st grade - ,

    |||| .. is correct.

    the | is used as a ten.
    the . is used as a one.
    They are base ten.
    Blocks are used for this at school.
    They are also called longs (|) and shorts (.).

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