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Add 90/21 and 70/20

1st number: 4 6/21, 2nd number: 3 10/20

90/21 + 70/20 is 109/14.

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,
    90/21 = 90 × 20/21 × 20 = 1800/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    70/20 = 70 × 21/20 × 21 = 1470/420
  4. Add the two fractions:
    1800/420 + 1470/420 = 1800 + 1470/420 = 3270/420
  5. 3270/420 simplified gives 109/14
  6. So, 90/21 + 70/20 = 109/14
    In mixed form: 711/14

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