Add 42/12 and 30/80
1st number: 3 6/12, 2nd number: 30/80
42/12 + 30/80 is 31/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 12 × 20 = 240,
42/12 = 42 × 20/12 × 20 = 840/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
30/80 = 30 × 3/80 × 3 = 90/240 - Add the two like fractions:
840/240 + 90/240 = 840 + 90/240 = 930/240 - 930/240 simplified gives 31/8
- So, 42/12 + 30/80 = 31/8
In mixed form: 37/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+30/80 42/12+60/80 42/24+30/80 42/12+90/80 42/36+30/80 42/60+30/80 42/84+30/80