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Add 20/72 and 16/21

20/72 + 16/21 is 131/126.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 21 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 72 × 7 = 504,
    20/72 = 20 × 7/72 × 7 = 140/504
  3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
    16/21 = 16 × 24/21 × 24 = 384/504
  4. Add the two like fractions:
    140/504 + 384/504 = 140 + 384/504 = 524/504
  5. 524/504 simplified gives 131/126
  6. So, 20/72 + 16/21 = 131/126
    In mixed form: 15/126

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