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Add 72/10 and 70/21

1st number: 7 2/10, 2nd number: 3 7/21

72/10 + 70/21 is 158/15.

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,
    70/21 = 70 × 10/21 × 10 = 700/210
  4. Add the two fractions:
    1512/210 + 700/210 = 1512 + 700/210 = 2212/210
  5. 2212/210 simplified gives 158/15
  6. So, 72/10 + 70/21 = 158/15
    In mixed form: 108/15

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