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Add 70/21 and 45/20

1st number: 3 7/21, 2nd number: 2 5/20

70/21 + 45/20 is 67/12.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420
  2. For the 1st fraction, since 21 × 20 = 420,
    70/21 = 70 × 20/21 × 20 = 1400/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    45/20 = 45 × 21/20 × 21 = 945/420
  4. Add the two fractions:
    1400/420 + 945/420 = 1400 + 945/420 = 2345/420
  5. After reducing the fraction, the answer is 67/12
  6. In mixed form: 57/12

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