Final answer:
The lowest common denominator for the fractions 1/5 and 1/10 is 10.
Step-by-step explanation:
The lowest common denominator (LCD) is the smallest multiple that two or more denominators have in common. To find the LCD for the fractions 1/5 and 1/10, we need to determine the smallest multiple that 5 and 10 share. In this case, the LCD is 10, since both 5 and 10 are divisible evenly by 10. Therefore, the lowest common denominator for 1/5 and 1/10 is 10.