Add 45/20 and 70/80
1st number: 2 5/20, 2nd number: 70/80
45/20 + 70/80 is 25/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
45/20 = 45 × 4/20 × 4 = 180/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
70/80 = 70 × 1/80 × 1 = 70/80 - Add the two like fractions:
180/80 + 70/80 = 180 + 70/80 = 250/80 - 250/80 simplified gives 25/8
- So, 45/20 + 70/80 = 25/8
In mixed form: 31/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+70/80 45/40+70/80 45/60+70/80