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Add 72/10 and 28/21

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

72/10 + 28/21 is 128/15.

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,
    28/21 = 28 × 10/21 × 10 = 280/210
  4. Add the two fractions:
    1512/210 + 280/210 = 1512 + 280/210 = 1792/210
  5. 1792/210 simplified gives 128/15
  6. So, 72/10 + 28/21 = 128/15
    In mixed form: 88/15

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