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)