Add 21/28 and 10/42
21/28 + 10/42 is 83/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
21/28 = 21 × 3/28 × 3 = 63/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
10/42 = 10 × 2/42 × 2 = 20/84 - Add the two like fractions:
63/84 + 20/84 = 63 + 20/84 = 83/84 - So, 21/28 + 10/42 = 83/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+10/42 21/28+20/42 21/56+10/42 21/28+10/84 63/28+10/42 21/28+30/42 21/84+10/42 21/28+50/42 21/28+70/42