What is 1/7 minus 3/9?

Looking for the result of 1/7 - 3/9? Follow this step-by-step guide to understand how to subtract these two fractions.

How to subtract 1/7 by 3/9?

1 7 − 3 9 = (1 × 9) − (3 × 7) 7 × 9 = -12 63 = -4 21
  1. Multiply the numerator of the first term, with the denominator of the second term: 1 × 9 = 9
  2. Multiply the numerator of the second term, with the denominator of the first term: 3 × 7 = 21
  3. Subtract both of these results together to form the new numerator: 9 − 21 = -12
  4. Multiply both denominators together to form the new denominator: 7 × 9 = 63
  5. Combine the results to get the new fraction: -12/63
  6. Simplify the fraction (-12/63) by dividing both the numerator and the denominator by their GCD (3):
    • -12/3 = -4
    • 63/3 = 21
  7. This gives: -4/21.

The result of subtracting 1/7 and 3/9 is : -4/21 (or -0.19047619047619 in its decimal form)