# Grid-Ins

## Student-Produced Response

How many different three-digit numbers between 100 and 1,000 have 5 as the tens digit?

Correct Answer: 90

**Explanation:**

In the 100's, the numbers with 5 as the tens digit are 150, 151, 152, ..., 159 (ten numbers). Also, there will be 10 such numbers in the 200's, in the 300's, etc. Therefore, there are **10 x 9 = 90** three-digit numbers between 100 and 1,000 that have 5 as the tens digit.

(from the October 18, 1997 test)

(from the October 14, 1997 test)