What is 3/9 minus 8/7?

Looking for the result of 3/9 - 8/7? Follow this step-by-step guide to understand how to subtract these two fractions.

How to subtract 3/9 by 8/7?

3 9 − 8 7 = (3 × 7) − (8 × 9) 9 × 7 = -51 63 = -17 21
  1. Multiply the numerator of the first term, with the denominator of the second term: 3 × 7 = 21
  2. Multiply the numerator of the second term, with the denominator of the first term: 8 × 9 = 72
  3. Subtract both of these results together to form the new numerator: 21 − 72 = -51
  4. Multiply both denominators together to form the new denominator: 9 × 7 = 63
  5. Combine the results to get the new fraction: -51/63
  6. Simplify the fraction (-51/63) by dividing both the numerator and the denominator by their GCD (3):
    • -51/3 = -17
    • 63/3 = 21
  7. This gives: -17/21.

The result of subtracting 3/9 and 8/7 is : -17/21 (or -0.80952380952381 in its decimal form)