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Add 90/20 and 70/21

1st number: 4 10/20, 2nd number: 3 7/21

90/20 + 70/21 is 47/6.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    90/20 = 90 × 21/20 × 21 = 1890/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    70/21 = 70 × 20/21 × 20 = 1400/420
  4. Add the two like fractions:
    1890/420 + 1400/420 = 1890 + 1400/420 = 3290/420
  5. 3290/420 simplified gives 47/6
  6. So, 90/20 + 70/21 = 47/6
    In mixed form: 75/6

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