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Add 72/10 and 42/21

1st number: 7 2/10, 2nd number: 2 0/21

72/10 + 42/21 is 46/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 21 is 210
  2. For the 1st fraction, since 10 × 21 = 210,
    72/10 = 72 × 21/10 × 21 = 1512/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    42/21 = 42 × 10/21 × 10 = 420/210
  4. Add the two fractions:
    1512/210 + 420/210 = 1512 + 420/210 = 1932/210
  5. 1932/210 simplified gives 46/5
  6. So, 72/10 + 42/21 = 46/5
    In mixed form: 91/5

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