Explanation:
To express 4/10 in its lowest terms, we need to simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor.
The greatest common divisor of 4 and 10 is 2. By dividing both the numerator and the denominator by 2, we get:
4 ÷ 2 = 2
10 ÷ 2 = 5
Therefore, 4/10 in its lowest terms is 2/5.