Add 21/4 and 56/70
1st number: 5 1/4, 2nd number: 56/70
21/4 + 56/70 is 121/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 4 × 35 = 140,
21/4 = 21 × 35/4 × 35 = 735/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
56/70 = 56 × 2/70 × 2 = 112/140 - Add the two like fractions:
735/140 + 112/140 = 735 + 112/140 = 847/140 - 847/140 simplified gives 121/20
- So, 21/4 + 56/70 = 121/20
In mixed form: 61/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+56/70 21/8+56/70 63/4+56/70 21/12+56/70 21/20+56/70 21/28+56/70