Add 21/45 and 5/10
21/45 + 5/10 is 29/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
21/45 = 21 × 2/45 × 2 = 42/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
5/10 = 5 × 9/10 × 9 = 45/90 - Add the two like fractions:
42/90 + 45/90 = 42 + 45/90 = 87/90 - 87/90 simplified gives 29/30
- So, 21/45 + 5/10 = 29/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+5/10 21/90+5/10 21/45+5/20 63/45+5/10 21/45+15/10 21/45+5/30 21/45+25/10 21/45+5/50 21/45+35/10 21/45+5/70