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## Multiplying A 2-digit Number By 43

 Multiplying A 2-digit Number By 43Multiplying a 2-digit number by 43 Select a 2-digit number. Multiply the number by four. Add one zero. To this add three times the original number.    Example: The 2-digit number chosen to multiply by 43 is 21. Multiply by 4: 4 × 21 = 84. Add one zero: 840. To this add three times the original number: 840 + 3(21) = 840 + 63 = 900 + 3 = 903. So 43 × 21 is 903.    See the pattern? The 2-digit number chosen to multiply by 43 is 52. Multiply by 4: 4 × 52 = 200 + 8 = 208. Add one zero: 2080. To this add three times the original number: 2080 + 3(52) = 2080 + 150 + 6 = 2180 + 50 + 6 = 2230 + 6 = 2236. So 43 × 52 is 2236.   Remember to add and multiply left to right in manageable increments, and you will be able to give these products using mental math.

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26 Sep, 2021, 02:20:40 AM