Subtract 28/45 from 1/42
1/42 - 28/45 is -377/630.
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,
1/42 = 1 × 15/42 × 15 = 15/630 - Likewise, for the 2nd fraction, since 45 × 14 = 630,
28/45 = 28 × 14/45 × 14 = 392/630 - Subtract the two like fractions:
15/630 - 392/630 = 15 - 392/630 = -377/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42-28/45 1/42-56/45 1/84-28/45 1/42-28/90 3/42-28/45 1/42-84/45 5/42-28/45 7/42-28/45