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Add 72/21 and 42/10

1st number: 3 9/21, 2nd number: 4 2/10

72/21 + 42/10 is 267/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 10 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    72/21 = 72 × 10/21 × 10 = 720/210
  3. Likewise, for the 2nd fraction, since 10 × 21 = 210,
    42/10 = 42 × 21/10 × 21 = 882/210
  4. Add the two fractions:
    720/210 + 882/210 = 720 + 882/210 = 1602/210
  5. After reducing the fraction, the answer is 267/35
  6. In mixed form: 722/35

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