Subtract 70/45 from 9/7, Solve 1 2/7

Subtract 70/45 from 9/7

1^st number: 1 2/7, 2^nd number: 1 25/45

9/7 - 70/45 is -17/63.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 45 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 7 × 45 = 315,
9/7 = 9 × 45/7 × 45 = 405/315
Likewise, for the 2nd fraction, since 45 × 7 = 315,
70/45 = 70 × 7/45 × 7 = 490/315
Subtract the two like fractions:
405/315 - 490/315 = 405 - 490/315 = -85/315
After reducing the fraction, the answer is -17/63

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad