Add 21/45 and 72/54
1st number: 21/45, 2nd number: 1 18/54
21/45 + 72/54 is 9/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 45 × 6 = 270,
21/45 = 21 × 6/45 × 6 = 126/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
72/54 = 72 × 5/54 × 5 = 360/270 - Add the two like fractions:
126/270 + 360/270 = 126 + 360/270 = 486/270 - 486/270 simplified gives 9/5
- So, 21/45 + 72/54 = 9/5
In mixed form: 14/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+72/54 21/90+72/54 63/45+72/54