Add 45/90 and 72/20
1st number: 45/90, 2nd number: 3 12/20
45/90 + 72/20 is 41/10.
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,
45/90 = 45 × 2/90 × 2 = 90/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
72/20 = 72 × 9/20 × 9 = 648/180 - Add the two like fractions:
90/180 + 648/180 = 90 + 648/180 = 738/180 - 738/180 simplified gives 41/10
- So, 45/90 + 72/20 = 41/10
In mixed form: 41/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 45/90+72/40 45/90+72/60