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Add 63/70 and 42/80

63/70 + 42/80 is 57/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 80 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 70 × 8 = 560,
    63/70 = 63 × 8/70 × 8 = 504/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    42/80 = 42 × 7/80 × 7 = 294/560
  4. Add the two like fractions:
    504/560 + 294/560 = 504 + 294/560 = 798/560
  5. 798/560 simplified gives 57/40
  6. So, 63/70 + 42/80 = 57/40
    In mixed form: 117/40

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