Add 1/21 and 72/84
1/21 + 72/84 is 19/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
1/21 = 1 × 4/21 × 4 = 4/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
72/84 = 72 × 1/84 × 1 = 72/84 - Add the two like fractions:
4/84 + 72/84 = 4 + 72/84 = 76/84 - 76/84 simplified gives 19/21
- So, 1/21 + 72/84 = 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+72/84 1/42+72/84 3/21+72/84 1/63+72/84 5/21+72/84 7/21+72/84