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Add 42/84 and 20/72

42/84 + 20/72 is 7/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 72 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 84 × 6 = 504,
    42/84 = 42 × 6/84 × 6 = 252/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    20/72 = 20 × 7/72 × 7 = 140/504
  4. Add the two like fractions:
    252/504 + 140/504 = 252 + 140/504 = 392/504
  5. 392/504 simplified gives 7/9
  6. So, 42/84 + 20/72 = 7/9

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