Add 42/90 and 15/8
1st number: 42/90, 2nd number: 1 7/8
42/90 + 15/8 is 281/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
42/90 = 42 × 4/90 × 4 = 168/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
15/8 = 15 × 45/8 × 45 = 675/360 - Add the two like fractions:
168/360 + 675/360 = 168 + 675/360 = 843/360 - 843/360 simplified gives 281/120
- So, 42/90 + 15/8 = 281/120
In mixed form: 241/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/90+15/8 42/90+30/8 42/90+15/16 42/90+45/8 42/90+15/24 42/90+75/8 42/90+15/40 42/90+15/56