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Add 21/80 and 54/70

21/80 + 54/70 is 579/560.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 70 is 560
  2. For the 1st fraction, since 80 × 7 = 560,
    21/80 = 21 × 7/80 × 7 = 147/560
  3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
    54/70 = 54 × 8/70 × 8 = 432/560
  4. Add the two fractions:
    147/560 + 432/560 = 147 + 432/560 = 579/560
  5. In mixed form: 119/560

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