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Add 21/28 and 4/40

21/28 + 4/40 is 17/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 40 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 28 × 10 = 280,
    21/28 = 21 × 10/28 × 10 = 210/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    4/40 = 4 × 7/40 × 7 = 28/280
  4. Add the two like fractions:
    210/280 + 28/280 = 210 + 28/280 = 238/280
  5. 238/280 simplified gives 17/20
  6. So, 21/28 + 4/40 = 17/20

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