Add 42/80 and 90/15
1st number: 42/80, 2nd number: 6 0/15
42/80 + 90/15 is 261/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 15 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
42/80 = 42 × 3/80 × 3 = 126/240 - Likewise, for the 2nd fraction, since 15 × 16 = 240,
90/15 = 90 × 16/15 × 16 = 1440/240 - Add the two like fractions:
126/240 + 1440/240 = 126 + 1440/240 = 1566/240 - 1566/240 simplified gives 261/40
- So, 42/80 + 90/15 = 261/40
In mixed form: 621/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+90/15 42/80+90/30 42/80+90/45 42/80+90/75