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Subtract 21/30 from 2/7

2/7 - 21/30 is -29/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 30 is 210
  2. For the 1st fraction, since 7 × 30 = 210,
    2/7 = 2 × 30/7 × 30 = 60/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    21/30 = 21 × 7/30 × 7 = 147/210
  4. Subtract the two fractions:
    60/210 - 147/210 = 60 - 147/210 = -87/210
  5. After reducing the fraction, the answer is -29/70

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