Add 21/35 and 18/45
21/35 + 18/45 is 1/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 45 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 35 × 9 = 315,
21/35 = 21 × 9/35 × 9 = 189/315 - Likewise, for the 2nd fraction, since 45 × 7 = 315,
18/45 = 18 × 7/45 × 7 = 126/315 - Add the two like fractions:
189/315 + 126/315 = 189 + 126/315 = 315/315 - 315/315 simplified gives 1/1
- So, 21/35 + 18/45 = 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+18/45 21/35+36/45 21/70+18/45 21/35+18/90 63/35+18/45 21/35+54/45 21/35+90/45