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Add 15/21 and 70/40

1st number: 15/21, 2nd number: 1 30/40

15/21 + 70/40 is 69/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    15/21 = 15 × 40/21 × 40 = 600/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    70/40 = 70 × 21/40 × 21 = 1470/840
  4. Add the two fractions:
    600/840 + 1470/840 = 600 + 1470/840 = 2070/840
  5. After reducing the fraction, the answer is 69/28
  6. In mixed form: 213/28

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