Add 42/54 and 21/30
42/54 + 21/30 is 133/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 30 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
42/54 = 42 × 5/54 × 5 = 210/270 - Likewise, for the 2nd fraction, since 30 × 9 = 270,
21/30 = 21 × 9/30 × 9 = 189/270 - Add the two like fractions:
210/270 + 189/270 = 210 + 189/270 = 399/270 - 399/270 simplified gives 133/90
- So, 42/54 + 21/30 = 133/90
In mixed form: 143/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/54+21/30 42/54+42/30 42/54+21/60 42/54+63/30 42/54+21/90