In counting from 1 to 99, how many tens digits are there in total?
90
90 is correct.
The tens digit is the second digit from the right, so only numbers with at least two digits have one. The numbers 1 to 9 are single-digit numbers and have no tens digit.
Every number from 10 to 99 is a two-digit number and has exactly one tens digit.
Count of numbers from 10 to 99 \(= 99 - 10 + 1 = 90\), so there are 90 tens digits in all.
Similar Questions
How many times does the digit 2 appear in the tens place in counting from 1 to 100?
The sum of four consecutive odd numbers is 160. Find the smallest number.
The sum of the digits of a 2-digit number is 11. If the digits are interchanged, the number decreases by 27. Find the interchanged number.
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Important Questions from Integers
Find the number of integers between $1$ and $150$ (inclusive) having $7$ as one of the digits but which are not divisible by $7$.
Integers are listed from 700 to 1000. In how many integers is the sum of the digits 10 ?
Using 2, 2, 3, 3, 3 as digits, how many distinct numbers greater than 30000 can be formed ?
Consider the following statements :
1. The sum of 5 consecutive integers can be 100.
2 The product of three consecutive natural numbers can be equal to their sum.
Which of the above statements is/are correct ?
The difference between a 2-digit number and the number obtained by interchanging the positions of the digits is 54.
Consider the following statements:
1. The sum of the two digits of the number can be determined only if the product of the two digits is known.
2. The difference between the two digits of the number can be determined.
Which of the above statements is/are correct?
