Subtract 4/40 from 80/36, Solve 2 8/36

Subtract 4/40 from 80/36

1^st number: 2 8/36, 2^nd number: 4/40

80/36 - 4/40 is 191/90.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 40 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 36 × 10 = 360,
80/36 = 80 × 10/36 × 10 = 800/360
Likewise, for the 2nd fraction, since 40 × 9 = 360,
4/40 = 4 × 9/40 × 9 = 36/360
Subtract the two like fractions:
800/360 - 36/360 = 800 - 36/360 = 764/360
After reducing the fraction, the answer is 191/90
In mixed form: 211/90

MathStep (Works offline)

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