Add 54/21 and 70/7
1st number: 2 12/21, 2nd number: 10 0/7
54/21 + 70/7 is 88/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
54/21 = 54 × 1/21 × 1 = 54/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
70/7 = 70 × 3/7 × 3 = 210/21 - Add the two like fractions:
54/21 + 210/21 = 54 + 210/21 = 264/21 - 264/21 simplified gives 88/7
- So, 54/21 + 70/7 = 88/7
In mixed form: 124/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+70/7 54/21+70/14 54/63+70/7 54/21+70/21 54/21+70/35 54/21+70/49