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Subtract 70/80 from 21/35

21/35 - 70/80 is -11/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 35 and 80 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 35 × 16 = 560,
    21/35 = 21 × 16/35 × 16 = 336/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    70/80 = 70 × 7/80 × 7 = 490/560
  4. Subtract the two like fractions:
    336/560 - 490/560 = 336 - 490/560 = -154/560
  5. After reducing the fraction, the answer is -11/40

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