Add 21/80 and 72/30
1st number: 21/80, 2nd number: 2 12/30
21/80 + 72/30 is 213/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 30 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 30 × 8 = 240,
72/30 = 72 × 8/30 × 8 = 576/240 - Add the two like fractions:
63/240 + 576/240 = 63 + 576/240 = 639/240 - 639/240 simplified gives 213/80
- So, 21/80 + 72/30 = 213/80
In mixed form: 253/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+72/30 21/80+72/60 63/80+72/30 21/80+72/90