Add 21/60 and 36/70
21/60 + 36/70 is 121/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
36/70 = 36 × 6/70 × 6 = 216/420 - Add the two like fractions:
147/420 + 216/420 = 147 + 216/420 = 363/420 - 363/420 simplified gives 121/140
- So, 21/60 + 36/70 = 121/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+36/70 21/60+72/70 63/60+36/70