Add 1/4 and 1/21
1/4 + 1/21 is 25/84.
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,
1/4 = 1 × 21/4 × 21 = 21/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Add the two like fractions:
21/84 + 4/84 = 21 + 4/84 = 25/84 - So, 1/4 + 1/21 = 25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/4+1/21 1/4+2/21 1/8+1/21 1/4+1/42 3/4+1/21 1/4+3/21 1/12+1/21 1/4+1/63 5/4+1/21 1/4+5/21 1/20+1/21 7/4+1/21 1/4+7/21 1/28+1/21