What number comes before 300 base 4?

To find the number that comes before 300 in base 4, we first convert 300 from base 4 to decimal. In base 4, 300 represents (3 \times 4^2 + 0 \times 4^1 + 0 \times 4^0 = 48) in decimal. The number before 48 in decimal is 47. Converting 47 back to base 4, we get 303. Therefore, the number that comes before 300 in base 4 is 303.