Answers

Add 21/70 and 45/15

1^st number: 21/70, 2^nd number: 3 0/15

21/70 + 45/15 is 33/10.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 15 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 70 × 3 = 210,
   21/70 = 21 × 3/70 × 3 = 63/210
3. Likewise, for the 2nd fraction, since 15 × 14 = 210,
   45/15 = 45 × 14/15 × 14 = 630/210
4. Add the two like fractions:
   63/210 + 630/210 = 63 + 630/210 = 693/210
5. 693/210 simplified gives 33/10
6. So, 21/70 + 45/15 = 33/10
   In mixed form: 33/10

MathStep (Works offline)

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

Related: ⁴²/₇₀+⁴⁵/₁₅ ²¹/₇₀+⁹⁰/₁₅ ²¹/₇₀+⁴⁵/₃₀ ⁶³/₇₀+⁴⁵/₁₅ ²¹/₇₀+⁴⁵/₇₅

Add Fractions Calculator