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Add 21/28 and 10/80

21/28 + 10/80 is 7/8.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 80 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 28 × 20 = 560,
    21/28 = 21 × 20/28 × 20 = 420/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    10/80 = 10 × 7/80 × 7 = 70/560
  4. Add the two like fractions:
    420/560 + 70/560 = 420 + 70/560 = 490/560
  5. 490/560 simplified gives 7/8
  6. So, 21/28 + 10/80 = 7/8

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