Add 81/4 and 10/21
1st number: 20 1/4, 2nd number: 10/21
81/4 + 10/21 is 1741/84.
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,
81/4 = 81 × 21/4 × 21 = 1701/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Add the two like fractions:
1701/84 + 40/84 = 1701 + 40/84 = 1741/84 - So, 81/4 + 10/21 = 1741/84
In mixed form: 2061/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/4+20/21 81/8+10/21 81/4+10/42 81/4+30/21 81/12+10/21 81/4+10/63 81/4+50/21 81/20+10/21 81/4+70/21 81/28+10/21