Add to 10 Tens Digit


    • Athan Strebeck on September 9, 2020 at 5:39 pm
    • Reply

    If the first digits of two numbers add to 10 and the second digits of each number are the same:
    1. Multiply the two last digits times each other (if the answer is a
    one-digit number, put a zero before it).
    2. Multiply the two first digits times each other and add the last digit.

Leave a Reply

Your email address will not be published.