Subtract 30/72 from 42/45
42/45 - 30/72 is 31/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
42/45 = 42 × 8/45 × 8 = 336/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
30/72 = 30 × 5/72 × 5 = 150/360 - Subtract the two like fractions:
336/360 - 150/360 = 336 - 150/360 = 186/360 - After reducing the fraction, the answer is 31/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45-30/72 42/45-60/72 42/90-30/72 42/45-90/72