7 x 1 = 7
7 x 57 = 399
There are 57 of them.
There are 22 numbers between 400 and 600 that are divisible by nine.
400 of them.
300.
50
59
500
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.
If you write all of the counting numbers from 200 to 400,you will write the digit ' 5 ' forty times.
410
two: 370 and 371
110
There are 57 such numbers.