Add 4/90 and 7/20
4/90 + 7/20 is 71/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
4/90 = 4 × 2/90 × 2 = 8/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Add the two like fractions:
8/180 + 63/180 = 8 + 63/180 = 71/180 - So, 4/90 + 7/20 = 71/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/90+7/20 4/90+14/20 4/90+7/40 12/90+7/20 4/90+21/20 4/90+7/60 20/90+7/20 4/90+35/20 28/90+7/20 4/90+49/20