Add 80/4 and 18/21
1st number: 20 0/4, 2nd number: 18/21
80/4 + 18/21 is 146/7.
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,
80/4 = 80 × 21/4 × 21 = 1680/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Add the two like fractions:
1680/84 + 72/84 = 1680 + 72/84 = 1752/84 - 1752/84 simplified gives 146/7
- So, 80/4 + 18/21 = 146/7
In mixed form: 206/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/4+36/21 80/8+18/21 80/4+18/42 80/4+54/21 80/12+18/21 80/4+18/63 80/4+90/21 80/20+18/21 80/28+18/21