Add 42/4 and 54/21
1st number: 10 2/4, 2nd number: 2 12/21
42/4 + 54/21 is 183/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
42/4 = 42 × 21/4 × 21 = 882/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
54/21 = 54 × 4/21 × 4 = 216/84 - Add the two like fractions:
882/84 + 216/84 = 882 + 216/84 = 1098/84 - 1098/84 simplified gives 183/14
- So, 42/4 + 54/21 = 183/14
In mixed form: 131/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4+54/21 42/8+54/21 42/4+54/42 42/12+54/21 42/4+54/63 42/20+54/21 42/28+54/21