Here's how to count in base 4 for all who need help! Each digit in base ten is the value of that number times 4 to the power of the place of the digit (with ones being the 0th place, tens being the 1st place and so on). So a 2 in the ones place is equivalent to 2*4^0 (or just 2). A 3 in the hundreds place is equivalent to 3*4^2 (or 48). The final number in base ten is adding the converted numbers. Converting from base ten to base four is the complete opposite.
I probably explained that horribly, so let me use examples. Say we want to convert 67 to base 4. The highest power of four that can go into 67 is 4^3 (64). Only one 64 can go into 67, so the thousands digit(what 4^3 will be) is 1. 67 - 64 leaves 3. 4^2 (16) and 4^1 (4) are both greater than 3 so the hundreds and tens place will remain at 0. 4^0 (1) however can go into 3 three times meaning the ones digit will be 3. That leaves our final answer to be 1003.
I hope I didn't miserably fain at explaining, but here you go!