Answers

Subtract 9/10 from 2/5

2/5 - 9/10 is -1/2.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 5 and 10 is 10
2. For the 1st fraction, since 5 × 2 = 10,
   2/5 = 2 × 2/5 × 2 = 4/10
3. Likewise, for the 2nd fraction, since 10 × 1 = 10,
   9/10 = 9 × 1/10 × 1 = 9/10
4. Subtract the two fractions:
   4/10 - 9/10 = 4 - 9/10 = -5/10
5. After reducing the fraction, the answer is -1/2

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