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Add 20/12 and 21/90

1st number: 1 8/12, 2nd number: 21/90

20/12 + 21/90 is 19/10.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 90 is 180
  2. For the 1st fraction, since 12 × 15 = 180,
    20/12 = 20 × 15/12 × 15 = 300/180
  3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
    21/90 = 21 × 2/90 × 2 = 42/180
  4. Add the two fractions:
    300/180 + 42/180 = 300 + 42/180 = 342/180
  5. 342/180 simplified gives 19/10
  6. So, 20/12 + 21/90 = 19/10
    In mixed form: 19/10

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