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For example, 23 x 11 = 253 (2 + 3 = 5) and 36 x 11 = 396 (3 + 6 = 9). When the sum of the two numbers is 10 or greater, just carry the one to the 100s column (49 x 11 = 539). When you multiply a three-digit number by 11, the product is a four-digit number. The first and last digits remain the same (unless there is a carry) and the 10s column is the sum of the first two numbers (from the right) and 100s column is the sum of the middle and the third number plus any carry. For example, 245 x 11 = 2695 and 139 x 11 = 1529.

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