Multiple choice general knowledge math & puzzles

An elegant way of multiplying numbers. 21 x 23 = ?

  1. 463

  2. 473

  3. 483

  4. 493
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

21 × 23 = 483. This can be calculated using Vedic mathematics' 'base method' or simply by standard multiplication: 21 × 23 = 21 × (20 + 3) = 420 + 63 = 483. In Vedic math, for numbers close to a base, you can also use the formula: (21 + 3) | (3 × 1) = 24 | 3 = 483, treating the left part as tens and right part as units when both numbers are close to 20. The other options are incorrect computational results.

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