Add 21/28 and 42/4
1st number: 21/28, 2nd number: 10 2/4
21/28 + 42/4 is 45/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 4 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
21/28 = 21 × 1/28 × 1 = 21/28 - Likewise, for the 2nd fraction, since 4 × 7 = 28,
42/4 = 42 × 7/4 × 7 = 294/28 - Add the two like fractions:
21/28 + 294/28 = 21 + 294/28 = 315/28 - 315/28 simplified gives 45/4
- So, 21/28 + 42/4 = 45/4
In mixed form: 111/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+42/4 21/28+84/4 21/56+42/4 21/28+42/8 63/28+42/4 21/84+42/4 21/28+42/12 21/28+42/20 21/28+42/28