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Math Challenge I-A Spring 2019 Week 5

 
 
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Math Challenge I-A Spring 2019 Week 5
TAmy - 2019年03月30日 Saturday 18:58
 

The number 2424 has the property that it is divisible by its lead digit. How many whole numbers (strictly) between 2020 and 6060 have this property?



What does it mean?

 
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回复: Math Challenge I-A Spring 2019 Week 5
TAmy - 2019年03月31日 Sunday 19:11
 

never mind

 
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Re: Math Challenge I-A Spring 2019 Week 5
ReynosoDavid - 2019年04月1日 Monday 10:41
 

Just in case you still need some help with this problem: The leading digit is the first digit on the left, so you want to find how many numbers between $20$ and $60$ are divisible by their tens digits.

 
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