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Add 21/42 and 90/20

1st number: 21/42, 2nd number: 4 10/20

21/42 + 90/20 is 5/1.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    21/42 = 21 × 10/42 × 10 = 210/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    90/20 = 90 × 21/20 × 21 = 1890/420
  4. Add the two fractions:
    210/420 + 1890/420 = 210 + 1890/420 = 2100/420
  5. 2100/420 simplified gives 5/1
  6. So, 21/42 + 90/20 = 5/1

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