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Elementary Math for Educators

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give three ways a student could find the product of 9x7 if she had not memorized this fact.

  • Elementary Math for Educators - ,

    Add nine 7's
    Multiply 3 times 7. Multiply that answer by 3.
    Multiply 10 times 7 and subtract 9.

    Also -- remember that the digits of any product of 9 and another number add up to 9 or a multiple of 9.
    Examples: 18, 27, 36, etc.

  • Elementary Math for Educators - ,

    1. Add nine 7's
    2. Multiply 3 times 7. Multiply that answer by 3.
    3. Multiply 10 times 7 and subtract 9.
    4. put your seven finger down and count on both sides and put the numbers together

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