If you write all of the counting numbers from 200 to 400,you will write the digit ' 5 ' forty times.
There are 151 even numbers between 100 and 400. To find this, you can use the formula for calculating the number of integers in a range: (largest number - smallest number) / 2 + 1. In this case, it would be (400 - 100) / 2 + 1 = 151.
110...... 500 to 599=100 405.415 till 495
The 17 prime numbers between 400 and 500 are 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, and 499.
180
500
410
410
There are 10 of them. Here they are: 404, 414, 424, 434, 444, 454, 464, 474, 484, 494
There are 22 numbers between 400 and 600 that are divisible by nine.
400 of them.
300.
-200
The answer is 400-100-1 = 299 (excluding both 100 and 400).
50
59
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.