Quin has 28 state quarters collected. he wants to have a complete set of the 50 state quarters. How many more quarters does he need to collect?

50 - 28 = ?

To find out how many more quarters Quin needs to collect, we first need to calculate the difference between the number of quarters he already has and the total number of state quarters.

1. Calculate the number of state quarters Quin still needs:
Total number of state quarters - Number of quarters Quin already has

2. In this case, the total number of state quarters is 50, and Quin already has 28 quarters.

Number of quarters Quin still needs = 50 - 28

3. Using subtraction, we can find the difference:

Number of quarters Quin still needs = 22

Therefore, Quin still needs to collect 22 more state quarters to have a complete set of the 50 state quarters.