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Add 1/28 and 21/90

1/28 + 21/90 is 113/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 90 is 1260

    Next, find the equivalent fraction of both fractional numbers with denominator 1260
  2. For the 1st fraction, since 28 × 45 = 1260,
    1/28 = 1 × 45/28 × 45 = 45/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    21/90 = 21 × 14/90 × 14 = 294/1260
  4. Add the two like fractions:
    45/1260 + 294/1260 = 45 + 294/1260 = 339/1260
  5. 339/1260 simplified gives 113/420
  6. So, 1/28 + 21/90 = 113/420

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