Add 42/70 and 21/36
42/70 + 21/36 is 71/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 36 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 70 × 18 = 1260,
42/70 = 42 × 18/70 × 18 = 756/1260 - Likewise, for the 2nd fraction, since 36 × 35 = 1260,
21/36 = 21 × 35/36 × 35 = 735/1260 - Add the two like fractions:
756/1260 + 735/1260 = 756 + 735/1260 = 1491/1260 - 1491/1260 simplified gives 71/60
- So, 42/70 + 21/36 = 71/60
In mixed form: 111/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/70+21/36 42/70+42/36 42/70+21/72 42/70+63/36