Add 81/42 and 63/8
1st number: 1 39/42, 2nd number: 7 7/8
81/42 + 63/8 is 549/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
81/42 = 81 × 4/42 × 4 = 324/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168 - Add the two like fractions:
324/168 + 1323/168 = 324 + 1323/168 = 1647/168 - 1647/168 simplified gives 549/56
- So, 81/42 + 63/8 = 549/56
In mixed form: 945/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84+63/8 81/42+63/16 81/42+63/24 81/42+63/40 81/42+63/56