Write down the last digit of the number you are
multiplying by 11.
Add the last digit to the digit on its left. Write down
the last digit of the sum and carry if necessary.
Move one digit to the left.
Add that digit to the digit on its left. Write (to the
left) and carry.
Continue the process of moving to the left and adding
until there are no more digits.
Example:
23 × 11 =
Write the last digit: 3
3
Add 3 and 2. 3 + 2 = 5
53
Move to the 2.
Since there are no more numbers to the
left of the 2 and there is no carry from the previous
sum, write down 2.
253
Therefore, 23 × 11 = 253.
Example:
846 × 11 =
Write the last number: 6
6
Add 6 and 4. 6 + 4 = 10.
06
(carry 1)
Move to the 4.
Add 4 and 8 and the carry. 4 + 8 + 1 = 13
306
(carry 1)
Move to the 8.
Since 8 is the last number, just add the
carry. 8 + 1 = 9
9306
Therefore, 846 × 11 = 9306.
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