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Add 18/21 and 90/72

1st number: 18/21, 2nd number: 1 18/72

18/21 + 90/72 is 59/28.

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,
    18/21 = 18 × 24/21 × 24 = 432/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    90/72 = 90 × 7/72 × 7 = 630/504
  4. Add the two like fractions:
    432/504 + 630/504 = 432 + 630/504 = 1062/504
  5. 1062/504 simplified gives 59/28
  6. So, 18/21 + 90/72 = 59/28
    In mixed form: 23/28

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