Add 30/4 and 80/21
1st number: 7 2/4, 2nd number: 3 17/21
30/4 + 80/21 is 475/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
30/4 = 30 × 21/4 × 21 = 630/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
80/21 = 80 × 4/21 × 4 = 320/84 - Add the two like fractions:
630/84 + 320/84 = 630 + 320/84 = 950/84 - 950/84 simplified gives 475/42
- So, 30/4 + 80/21 = 475/42
In mixed form: 1113/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/4+80/21 30/8+80/21 30/4+80/42 90/4+80/21 30/12+80/21 30/4+80/63 30/20+80/21 30/28+80/21