Add to 10 Ones Digit


    • Emily on August 23, 2016 at 7:02 pm
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    I have watched quite a few videos over the year, Mr. Gillespey, and all of them have proved useful during tests and competitions. Thank you for providing us with these tips!

    • Athan Strebeck on September 8, 2020 at 9:20 pm
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    Assuming that the first digit of two numbers are equal and the two second digits add up to 10:
    1. Multiply the last digit times the second last digit. If there is one digit,
    put a zero before the digit.

    2. Add 1 to one of the first digits and multiply the other first digit times that +1 digit.

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