3 Answered Questions for the topic Math Competitions Prep

Math Competitions Prep Algebra 2 Number Theory Parity

07/07/19

The units digit of a perfect square x is 4. What is the parity of the tens digit of x?

This is from my Math Challenge class. I have no idea of how to solve this. Please help.
Math Competitions Prep Algebra 2 Division Number Theory

07/05/19

How do I solve this problem regarding parity from my Math Challenge class?

The remainder when the product 1492 x 1776 x 1812 x 1996 is divided by 5 is A. 0B. 1 C. 2 D. 3 E. 4*what's the shortcut to figuring out the answer for problems like this?*
Math Competitions Prep Math Division Number Theory

07/05/19

How do I solve this problem regarding divisibility from my Math Challenge class?            

What remainder does the number (-50) leave after division by 7? The answer is 6. Why?

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