Add 21/45 and 25/8
1st number: 21/45, 2nd number: 3 1/8
21/45 + 25/8 is 431/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 45 × 8 = 360,
21/45 = 21 × 8/45 × 8 = 168/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
25/8 = 25 × 45/8 × 45 = 1125/360 - Add the two like fractions:
168/360 + 1125/360 = 168 + 1125/360 = 1293/360 - 1293/360 simplified gives 431/120
- So, 21/45 + 25/8 = 431/120
In mixed form: 371/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+25/8 21/45+50/8 21/90+25/8 21/45+25/16 63/45+25/8 21/45+75/8 21/45+25/24 21/45+25/40 21/45+25/56