Answers

Solutions by everydaycalculation.com

Everydaycalculation.com » Answers » Add fractions

Add 15/42 and 9/40

15/42 + 9/40 is 163/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    15/42 = 15 × 20/42 × 20 = 300/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    9/40 = 9 × 21/40 × 21 = 189/840
  4. Add the two fractions:
    300/840 + 189/840 = 300 + 189/840 = 489/840
  5. After reducing the fraction, the answer is 163/280

MathStep (Works offline)

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

Related:

© everydaycalculation.com