Add 21/80 and 30/60
21/80 + 30/60 is 61/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 60 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
21/80 = 21 × 3/80 × 3 = 63/240 - Likewise, for the 2nd fraction, since 60 × 4 = 240,
30/60 = 30 × 4/60 × 4 = 120/240 - Add the two like fractions:
63/240 + 120/240 = 63 + 120/240 = 183/240 - 183/240 simplified gives 61/80
- So, 21/80 + 30/60 = 61/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+30/60 63/80+30/60 21/80+90/60