Add 56/40 and 9/21
1st number: 1 16/40, 2nd number: 9/21
56/40 + 9/21 is 64/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
56/40 = 56 × 21/40 × 21 = 1176/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
9/21 = 9 × 40/21 × 40 = 360/840 - Add the two like fractions:
1176/840 + 360/840 = 1176 + 360/840 = 1536/840 - 1536/840 simplified gives 64/35
- So, 56/40 + 9/21 = 64/35
In mixed form: 129/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40+18/21 56/80+9/21 56/40+9/42 56/40+27/21 56/40+9/63 56/40+45/21 56/40+63/21