Add 54/21 and 70/49
1st number: 2 12/21, 2nd number: 1 21/49
54/21 + 70/49 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 49 is 147
Next, find the equivalent fraction of both fractional numbers with denominator 147 - For the 1st fraction, since 21 × 7 = 147,
54/21 = 54 × 7/21 × 7 = 378/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
70/49 = 70 × 3/49 × 3 = 210/147 - Add the two like fractions:
378/147 + 210/147 = 378 + 210/147 = 588/147 - 588/147 simplified gives 4/1
- So, 54/21 + 70/49 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+70/49 54/21+70/98 54/63+70/49