Add 81/40 and 30/84
1st number: 2 1/40, 2nd number: 30/84
81/40 + 30/84 is 667/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
81/40 = 81 × 21/40 × 21 = 1701/840 - Likewise, for the 2nd fraction, since 84 × 10 = 840,
30/84 = 30 × 10/84 × 10 = 300/840 - Add the two like fractions:
1701/840 + 300/840 = 1701 + 300/840 = 2001/840 - 2001/840 simplified gives 667/280
- So, 81/40 + 30/84 = 667/280
In mixed form: 2107/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/40+60/84 81/80+30/84 81/40+90/84