Answers

Add 3/45 and 21/63

3/45 + 21/63 is 2/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 45 and 63 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 45 × 7 = 315,
   3/45 = 3 × 7/45 × 7 = 21/315
3. Likewise, for the 2nd fraction, since 63 × 5 = 315,
   21/63 = 21 × 5/63 × 5 = 105/315
4. Add the two like fractions:
   21/315 + 105/315 = 21 + 105/315 = 126/315
5. 126/315 simplified gives 2/5
6. So, 3/45 + 21/63 = 2/5

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁶/₄₅+²¹/₆₃ ³/₄₅+⁴²/₆₃ ³/₉₀+²¹/₆₃ ⁹/₄₅+²¹/₆₃ ¹⁵/₄₅+²¹/₆₃ ²¹/₄₅+²¹/₆₃

Add Fractions Calculator