Answers

2014-08-30T10:27:34+08:00
First you have 230, 240, 250, 260, 270, 280, 290= 7
then 300, 310, 320, 330, 340, 350, 360, 370, 380, 390= 10
then 400, 410, 420, 430, 440= 5
add it all 7+10+5= 22
There are 22 numbers that ends with 0.

0