Add 7/45 and 20/90
7/45 + 20/90 is 17/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
7/45 = 7 × 2/45 × 2 = 14/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Add the two like fractions:
14/90 + 20/90 = 14 + 20/90 = 34/90 - 34/90 simplified gives 17/45
- So, 7/45 + 20/90 = 17/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/45+20/90 7/45+40/90 7/90+20/90 21/45+20/90 7/45+60/90 35/45+20/90 49/45+20/90