Add 21/30 and 54/45
1st number: 21/30, 2nd number: 1 9/45
21/30 + 54/45 is 19/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
54/45 = 54 × 2/45 × 2 = 108/90 - Add the two like fractions:
63/90 + 108/90 = 63 + 108/90 = 171/90 - 171/90 simplified gives 19/10
- So, 21/30 + 54/45 = 19/10
In mixed form: 19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+54/45 21/60+54/45 21/30+54/90 63/30+54/45 21/90+54/45