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Add 21/28 and 90/60

1st number: 21/28, 2nd number: 1 30/60

21/28 + 90/60 is 9/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 60 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 28 × 15 = 420,
    21/28 = 21 × 15/28 × 15 = 315/420
  3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
    90/60 = 90 × 7/60 × 7 = 630/420
  4. Add the two like fractions:
    315/420 + 630/420 = 315 + 630/420 = 945/420
  5. 945/420 simplified gives 9/4
  6. So, 21/28 + 90/60 = 9/4
    In mixed form: 21/4

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