Let me write all the multiples of 10 and see how many zeroes we get.

200 ---> two zeroes

210 ---> one zeroes

220 ---> one zeroes

230 ---> one zeroes

240 ---> one zeroes

250 ---> three zeroes. 250 = 5*5 *10. Every 5 delivers one zero.

260 ---> one zeroes

270 ---> one zeroes

280 ---> one zeroes

290 ---> one zeroes

300 ---> two zeroes

Adding we get 2+1+1+1+1+3+1+1+1+1+2 = 15

TomB wrote:

If N is the product of all multiples of 10 between 199 and 301, what is the greatest integer m for which [N][/1o]m is an integer?here m is 10 to the number of times m(likex.x)

10

11

13

14

15