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Add 28/21 and 4/90

1st number: 1 7/21, 2nd number: 4/90

28/21 + 4/90 is 62/45.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 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,
    4/90 = 4 × 7/90 × 7 = 28/630
  4. Add the two fractions:
    840/630 + 28/630 = 840 + 28/630 = 868/630
  5. 868/630 simplified gives 62/45
  6. So, 28/21 + 4/90 = 62/45
    In mixed form: 117/45

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