Answers

Subtract 81/30 from 16/80

1^st number: 16/80, 2^nd number: 2 21/30

16/80 - 81/30 is -5/2.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 30 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 80 × 3 = 240,
   16/80 = 16 × 3/80 × 3 = 48/240
3. Likewise, for the 2nd fraction, since 30 × 8 = 240,
   81/30 = 81 × 8/30 × 8 = 648/240
4. Subtract the two like fractions:
   48/240 - 648/240 = 48 - 648/240 = -600/240
5. After reducing the fraction, the answer is -5/2

MathStep (Works offline)

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

Related: ³²/₈₀-⁸¹/₃₀ ¹⁶/₈₀-⁸¹/₆₀ ⁴⁸/₈₀-⁸¹/₃₀ ¹⁶/₈₀-⁸¹/₉₀

Subtract Fractions Calculator