Add 15/42 and 90/40
1st number: 15/42, 2nd number: 2 10/40
15/42 + 90/40 is 73/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
15/42 = 15 × 20/42 × 20 = 300/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
90/40 = 90 × 21/40 × 21 = 1890/840 - Add the two like fractions:
300/840 + 1890/840 = 300 + 1890/840 = 2190/840 - 2190/840 simplified gives 73/28
- So, 15/42 + 90/40 = 73/28
In mixed form: 217/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+90/40 15/84+90/40 15/42+90/80 45/42+90/40 75/42+90/40