Subtract 21/54 from 18/35
18/35 - 21/54 is 79/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 54 is 1890
Next, find the equivalent fraction of both fractional numbers with denominator 1890 - For the 1st fraction, since 35 × 54 = 1890,
18/35 = 18 × 54/35 × 54 = 972/1890 - Likewise, for the 2nd fraction, since 54 × 35 = 1890,
21/54 = 21 × 35/54 × 35 = 735/1890 - Subtract the two like fractions:
972/1890 - 735/1890 = 972 - 735/1890 = 237/1890 - After reducing the fraction, the answer is 79/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/35-21/54 18/35-42/54 18/70-21/54 54/35-21/54 18/35-63/54 90/35-21/54