375,031 views
36 votes
36 votes
How many numbers from 100 to 999 have exactly one zero digit

How many numbers from 100 to 999 have exactly one zero digit-example-1
User Manouchka
by
2.7k points

1 Answer

11 votes
11 votes

Answer:

180.

Explanation:

100 contains 2 zero digits.

101 - 109 have 9 numbers, 110 to 200 have 11 numbers

so for 101 to 200 its 20 numbers

Its also 20 for 201 to 300 and for all sets of 100 up to 900.

- that is 7 * 20 = 140 numbers

Finally from 901 to 999 we have 18.

Total = 20 + 140 + 18

= 2 + 20 + 140 + 18

= 180.

User Hirschme
by
2.9k points