Subtract 75/45 from 28/42
1st number: 28/42, 2nd number: 1 30/45
28/42 - 75/45 is -1/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 45 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
28/42 = 28 × 15/42 × 15 = 420/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
75/45 = 75 × 14/45 × 14 = 1050/630 - Subtract the two like fractions:
420/630 - 1050/630 = 420 - 1050/630 = -630/630 - After reducing the fraction, the answer is -1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-75/45 28/84-75/45 28/42-75/90 84/42-75/45