Binary Number Cards

In the chart below, figure out which cards should be face up or face down to get the correct number of dots.
Put a “1” under a card that should be face up and a “0” under a card that should be face down.

13: 1101

5: 0101

10: 1010

2: 0010

Explanation:

The binary system, on the other hand, is a base-2 number system. That means it only uses two numbers: 0 and 1. When you add one to one, you move the 1 one spot to the left into the twos place and put a 0 in the ones place

what is done with the dice is to have an example of how binary numbers are made until 15

i do not get the question.