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Mathematics - Speed Multiply Numbers Between 11 and 19
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Speed Multiply Numbers Between 11 and 19

Mathematics

To multiply two numbers that are between 11 and 19, add the ones digit of one number to the other number, multiply by 10, and then add the product of the ones digits. Example: 14 × 13 = (17 × 10) + (4 × 3) = 182

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