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Add 40/70 and 21/80

40/70 + 21/80 is 467/560.

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,
    40/70 = 40 × 8/70 × 8 = 320/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    21/80 = 21 × 7/80 × 7 = 147/560
  4. Add the two like fractions:
    320/560 + 147/560 = 320 + 147/560 = 467/560
  5. So, 40/70 + 21/80 = 467/560

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