Add 54/21 and 72/90
1st number: 2 12/21, 2nd number: 72/90
54/21 + 72/90 is 118/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
54/21 = 54 × 30/21 × 30 = 1620/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
72/90 = 72 × 7/90 × 7 = 504/630 - Add the two like fractions:
1620/630 + 504/630 = 1620 + 504/630 = 2124/630 - 2124/630 simplified gives 118/35
- So, 54/21 + 72/90 = 118/35
In mixed form: 313/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+72/90 54/63+72/90