![]() ![]() Divide by 10 (move decimal place one place to the left).Square the first digit, add the same digit to it, and then add 25 on the end of it and Presto! This one is really simple to get the hang of. ![]() Add 25 on the end of your answer in step 1.Multiply the first digit by itself plus 1.Try an Alternate Way: See video on multiplying large numbers by 11 HOWEVER, you can only have a single digit in the middle, so you have to carry the 1 over to the 4, resulting in 539. Then we place the answer of 13 in the middle 4 13 9. Remember : In case you happen to get a 10 or above in step 1, you must remember to carry the one over.Ĥ9*11=539 is achieved by adding both digits 4+9=13. Simply place the answer of 9 between the digits of 36.If you’re a visual learner, here are some great videos on mental math tricks:.For more Mental Math Tricks, visit these great sites below:.The Best App I use for Mental Math Tricks:.It might take you awhile but after a few practice problems, you’ll improve speed!. ![]()
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