Add 21/30 and 98/80
1st number: 21/30, 2nd number: 1 18/80
21/30 + 98/80 is 77/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 30 × 8 = 240,
21/30 = 21 × 8/30 × 8 = 168/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
98/80 = 98 × 3/80 × 3 = 294/240 - Add the two like fractions:
168/240 + 294/240 = 168 + 294/240 = 462/240 - 462/240 simplified gives 77/40
- So, 21/30 + 98/80 = 77/40
In mixed form: 137/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+98/80 21/60+98/80 63/30+98/80 21/90+98/80