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Add 20/28 and 42/80

20/28 + 42/80 is 347/280.

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,
    20/28 = 20 × 20/28 × 20 = 400/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    42/80 = 42 × 7/80 × 7 = 294/560
  4. Add the two like fractions:
    400/560 + 294/560 = 400 + 294/560 = 694/560
  5. 694/560 simplified gives 347/280
  6. So, 20/28 + 42/80 = 347/280
    In mixed form: 167/280

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