Add 21/72 and 98/20
1st number: 21/72, 2nd number: 4 18/20
21/72 + 98/20 is 623/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
21/72 = 21 × 5/72 × 5 = 105/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
98/20 = 98 × 18/20 × 18 = 1764/360 - Add the two like fractions:
105/360 + 1764/360 = 105 + 1764/360 = 1869/360 - 1869/360 simplified gives 623/120
- So, 21/72 + 98/20 = 623/120
In mixed form: 523/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/72+98/20 21/72+98/40 63/72+98/20 21/72+98/60