Our first tip helps you multiply the number eleven faster and more accurately. We illustrate the concept using an example. This example serves as a foundation for more complex variations and larger numbers. If you have any questions or feedback please feel free to add a comment to the post.
Tip #1: 72 * 11 = the first digit (7), sum of the first two digits (7+2), second digit (2) = 792
When multiplying a two digit number by 11 there are three steps to follow for the non-eleven multiplier to quickly get the answer.
Step 1) The ones place in the answer is equal to the ones place in the non-eleven multiplier, the far right digit - the number 2 in our example. _ _ 2
Step 2) The next number in the answer is the sum of the two digits in the non-eleven multiplier; 7 and 2 in the example, which is equal to 9. _ 92
Step 3) The last digit in the answer is the digit to the ten's place in the non-eleven multiplier, the far left digit - the number 7 in our example. 792