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Add 21/30 and 54/42

1st number: 21/30, 2nd number: 1 12/42

21/30 + 54/42 is 139/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 42 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 42 × 5 = 210,
    54/42 = 54 × 5/42 × 5 = 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 + 54/42 = 139/70
    In mixed form: 169/70

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