How many times does the digit 9 appear in the list of all integers from 1 to 600?

Guest Oct 24, 2020

#1**0 **

From 1 to 9 = 1 time

From 10 to 99 =19 times

From 100 to 600 =20 x 5 =100 times

**1 + 19 + 100 =120 times between 1 and 600**

Note: This counts repeated 9's such as 99, 199....etc.

Guest Oct 24, 2020

#2**0 **

Hint:

From 1-89 - nine "9"s

From 90-99 - eleven "9"s

Try using this for the three digit numbers

CalTheGreat Oct 24, 2020