Add 21/56 and 54/30
1st number: 21/56, 2nd number: 1 24/30
21/56 + 54/30 is 87/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 30 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840 - Likewise, for the 2nd fraction, since 30 × 28 = 840,
54/30 = 54 × 28/30 × 28 = 1512/840 - Add the two like fractions:
315/840 + 1512/840 = 315 + 1512/840 = 1827/840 - 1827/840 simplified gives 87/40
- So, 21/56 + 54/30 = 87/40
In mixed form: 27/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56+54/30 21/56+54/60 63/56+54/30 21/56+54/90