Add 20/10 and 21/45
1st number: 2 0/10, 2nd number: 21/45
20/10 + 21/45 is 37/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
20/10 = 20 × 9/10 × 9 = 180/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
21/45 = 21 × 2/45 × 2 = 42/90 - Add the two like fractions:
180/90 + 42/90 = 180 + 42/90 = 222/90 - 222/90 simplified gives 37/15
- So, 20/10 + 21/45 = 37/15
In mixed form: 27/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/10+21/45 20/10+42/45 20/10+21/90 60/10+21/45 20/10+63/45 20/30+21/45 20/50+21/45 20/70+21/45