Add 21/10 and 54/7
1st number: 2 1/10, 2nd number: 7 5/7
21/10 + 54/7 is 687/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 7 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 10 × 7 = 70,
21/10 = 21 × 7/10 × 7 = 147/70 - Likewise, for the 2nd fraction, since 7 × 10 = 70,
54/7 = 54 × 10/7 × 10 = 540/70 - Add the two like fractions:
147/70 + 540/70 = 147 + 540/70 = 687/70 - So, 21/10 + 54/7 = 687/70
In mixed form: 957/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10+54/7 21/20+54/7 21/10+54/14 63/10+54/7 21/30+54/7 21/10+54/21 21/50+54/7 21/10+54/35 21/70+54/7 21/10+54/49