Add 72/45 and 42/84
1st number: 1 27/45, 2nd number: 42/84
72/45 + 42/84 is 21/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 45 × 28 = 1260,
72/45 = 72 × 28/45 × 28 = 2016/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
42/84 = 42 × 15/84 × 15 = 630/1260 - Add the two like fractions:
2016/1260 + 630/1260 = 2016 + 630/1260 = 2646/1260 - 2646/1260 simplified gives 21/10
- So, 72/45 + 42/84 = 21/10
In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/90+42/84