Add 42/45 and 1/90
42/45 + 1/90 is 17/18.
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,
42/45 = 42 × 2/45 × 2 = 84/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
1/90 = 1 × 1/90 × 1 = 1/90 - Add the two like fractions:
84/90 + 1/90 = 84 + 1/90 = 85/90 - 85/90 simplified gives 17/18
- So, 42/45 + 1/90 = 17/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+1/90 42/45+2/90 42/90+1/90 42/45+3/90 42/45+5/90 42/45+7/90