The conversation between human and AI assistant.
[|Human|] Reduce the fraction 4/10
[|AI|] The fraction 4/10 can be reduced by dividing both the numerator and the denominator by their greatest common divisor, which in this case is 2. 

This will give you the reduced fraction 4/10 ÷ 2/2 = 2/5.
[|Human|] 
Reduce the fraction 4/10