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Add 20/21 and 20/72

20/21 + 20/72 is 155/126.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 21 × 24 = 504,
    20/21 = 20 × 24/21 × 24 = 480/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    20/72 = 20 × 7/72 × 7 = 140/504
  4. Add the two like fractions:
    480/504 + 140/504 = 480 + 140/504 = 620/504
  5. 620/504 simplified gives 155/126
  6. So, 20/21 + 20/72 = 155/126
    In mixed form: 129/126

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