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Add 90/20 and 30/80

1st number: 4 10/20, 2nd number: 30/80

90/20 + 30/80 is 39/8.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 80 is 80
  2. For the 1st fraction, since 20 × 4 = 80,
    90/20 = 90 × 4/20 × 4 = 360/80
  3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
    30/80 = 30 × 1/80 × 1 = 30/80
  4. Add the two fractions:
    360/80 + 30/80 = 360 + 30/80 = 390/80
  5. 390/80 simplified gives 39/8
  6. So, 90/20 + 30/80 = 39/8
    In mixed form: 47/8

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