Multiple choice

If 137 + 276 = 435 how much is 731 + 672?

  1. 534

  2. 1403

  3. 1623

  4. 1513
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C Correct answer
Explanation

The pattern involves reversing both numbers, then adding corresponding digits column-wise: reverse(137)=731, reverse(276)=672. Adding column digits: 7+6=13, 3+7=10, 1+2=3 gives 1-3-10-3, which rearranges to 1623. This pattern applied to 731+672: reverse(731)=137, reverse(672)=276, adding column digits: 1+2=3, 3+7=10, 7+6=13 gives 3-10-13, rearranging to 1623.

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