Add 21/2 and 81/70
1st number: 10 1/2, 2nd number: 1 11/70
21/2 + 81/70 is 408/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 2 × 35 = 70,
21/2 = 21 × 35/2 × 35 = 735/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
81/70 = 81 × 1/70 × 1 = 81/70 - Add the two like fractions:
735/70 + 81/70 = 735 + 81/70 = 816/70 - 816/70 simplified gives 408/35
- So, 21/2 + 81/70 = 408/35
In mixed form: 1123/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+81/70 21/4+81/70 63/2+81/70 21/6+81/70 21/10+81/70 21/14+81/70