Subtract 70/18 from 40/25, Solve 1 15/25

Subtract 70/18 from 40/25

1^st number: 1 15/25, 2^nd number: 3 16/18

40/25 - 70/18 is -103/45.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 18 is 450

Next, find the equivalent fraction of both fractional numbers with denominator 450
For the 1st fraction, since 25 × 18 = 450,
40/25 = 40 × 18/25 × 18 = 720/450
Likewise, for the 2nd fraction, since 18 × 25 = 450,
70/18 = 70 × 25/18 × 25 = 1750/450
Subtract the two like fractions:
720/450 - 1750/450 = 720 - 1750/450 = -1030/450
After reducing the fraction, the answer is -103/45

MathStep (Works offline)

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