Answers

Subtract 32/90 from 21/60

21/60 - 32/90 is -1/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 60 and 90 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 60 × 3 = 180,
   21/60 = 21 × 3/60 × 3 = 63/180
3. Likewise, for the 2nd fraction, since 90 × 2 = 180,
   32/90 = 32 × 2/90 × 2 = 64/180
4. Subtract the two like fractions:
   63/180 - 64/180 = 63 - 64/180 = -1/180

MathStep (Works offline)

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

Related: ⁴²/₆₀-³²/₉₀ ²¹/₆₀-⁶⁴/₉₀ ⁶³/₆₀-³²/₉₀ ²¹/₆₀-⁹⁶/₉₀

Subtract Fractions Calculator