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Add 21/30 and 9/7

1st number: 21/30, 2nd number: 1 2/7

21/30 + 9/7 is 139/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 7 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 30 × 7 = 210,
    21/30 = 21 × 7/30 × 7 = 147/210
  3. Likewise, for the 2nd fraction, since 7 × 30 = 210,
    9/7 = 9 × 30/7 × 30 = 270/210
  4. Add the two like fractions:
    147/210 + 270/210 = 147 + 270/210 = 417/210
  5. 417/210 simplified gives 139/70
  6. So, 21/30 + 9/7 = 139/70
    In mixed form: 169/70

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