Multiplying two-digit numbers by 11

To multiply a two digit number by 11, write the ones digit of the two-digit number at the ones place of the answer.

Add the ones and tens digit to get the middle number of the answer.

Write the tens digit of the number at the hundreds place of the answer.

Example:

To multiply 43 by 11, write 3 at the ones place of the answer.

Add the ones and tens digit (4 + 3 = 7), 7 is the middle number of the answer.

The tens digit 4 is in the hundreds place of the answer.

Thus, 43 x 11 = 473