Add 42/10 and 81/40
1st number: 4 2/10, 2nd number: 2 1/40
42/10 + 81/40 is 249/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 10 × 4 = 40,
42/10 = 42 × 4/10 × 4 = 168/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
81/40 = 81 × 1/40 × 1 = 81/40 - Add the two like fractions:
168/40 + 81/40 = 168 + 81/40 = 249/40 - So, 42/10 + 81/40 = 249/40
In mixed form: 69/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10+81/40 42/20+81/40 42/10+81/80 42/30+81/40 42/50+81/40 42/70+81/40