How many consecutive zeros, beginning from the ones digit, are there in $$1 \times 2 \times3 \times4\times5\times \cdots 49\times50$$? 
Overseas Competition->Knowledge Point->Number Theory Modules->Division without Remainders->Applying the Properties of Dividing without Remainders->Maximum/Minimum Problems of Division without Remainders  Overseas Competition->Knowledge Point->Number Theory Modules->Prime Factorization->Applying Prime Factorization->The Number of Zeros at the end of a Product