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Add 28/21 and 7/90

1st number: 1 7/21, 2nd number: 7/90

28/21 + 7/90 is 127/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 21 × 30 = 630,
    28/21 = 28 × 30/21 × 30 = 840/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    7/90 = 7 × 7/90 × 7 = 49/630
  4. Add the two like fractions:
    840/630 + 49/630 = 840 + 49/630 = 889/630
  5. 889/630 simplified gives 127/90
  6. So, 28/21 + 7/90 = 127/90
    In mixed form: 137/90

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