Add 42/90 and 15/45
42/90 + 15/45 is 4/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
42/90 = 42 × 1/90 × 1 = 42/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
15/45 = 15 × 2/45 × 2 = 30/90 - Add the two like fractions:
42/90 + 30/90 = 42 + 30/90 = 72/90 - 72/90 simplified gives 4/5
- So, 42/90 + 15/45 = 4/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+15/45 42/90+30/45 42/90+15/90 42/90+75/45