To easily multiply any 2-digit number by 11, you should use the 11-rule. For instance, the 2-digit number to be multiplied by 11 is 54. First, separate the two digits. Afterwards, add 5 and 4 together (5+4=9). Put the sum between the 2 numbers, and you’ll get 594. So 11 multiplied by 54 is equal to 594. |
But if the sum is greater than 9, you only put the "ones" digit in between the numbers and carry over the "tens" digit – example: 11 x 57 ... 5__7 ... 5+7=12 ... put 2 between the numbers and add 1 from the 12 to 5 in order to get 6 for a result of 627 ... 11 x 57 = 627
These rules were made from patterns and generalizations. For more, it’s just a matter of going to MathComplete.Com since this site is always updated with the newest math tricks available. This means you can regularly check this site for updated math tricks.
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