Add 45/21 and 81/40
1st number: 2 3/21, 2nd number: 2 1/40
45/21 + 81/40 is 1167/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
45/21 = 45 × 40/21 × 40 = 1800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
81/40 = 81 × 21/40 × 21 = 1701/840 - Add the two like fractions:
1800/840 + 1701/840 = 1800 + 1701/840 = 3501/840 - 3501/840 simplified gives 1167/280
- So, 45/21 + 81/40 = 1167/280
In mixed form: 447/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+81/40 45/42+81/40 45/21+81/80 45/63+81/40