Add 21/60 and 20/80
21/60 + 20/80 is 3/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 60 × 4 = 240,
21/60 = 21 × 4/60 × 4 = 84/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
20/80 = 20 × 3/80 × 3 = 60/240 - Add the two like fractions:
84/240 + 60/240 = 84 + 60/240 = 144/240 - 144/240 simplified gives 3/5
- So, 21/60 + 20/80 = 3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+20/80 21/60+40/80 63/60+20/80 21/60+60/80