Add 70/45 and 90/20
1st number: 1 25/45, 2nd number: 4 10/20
70/45 + 90/20 is 109/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
70/45 = 70 × 4/45 × 4 = 280/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
90/20 = 90 × 9/20 × 9 = 810/180 - Add the two like fractions:
280/180 + 810/180 = 280 + 810/180 = 1090/180 - 1090/180 simplified gives 109/18
- So, 70/45 + 90/20 = 109/18
In mixed form: 61/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/90+90/20 70/45+90/40 70/45+90/60