Multiplying over/under 100


    • S.C. on April 4, 2016 at 2:45 am
    • Reply

    There is actually an easier (well in my opinion) way to do this.
    For example: 95*104. You multiply the smaller number (95) by the ones digit of the larger number (4) and get 380. Write the the last 2 digits of the answer (80) and carry the 3. Then, you just add the 3 to the smaller number and write it in front. The answer is 9880. I think this trick is much easier to remember. I hope you understood what I was trying to say. 🙂

    1. This I believe is a variation of foil.

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