Multiply Two Numbers (No Zeros) to make 5 Billion
Date: 01/05/2002 at 10:45:06 From: Jessica Subject: Very big problem. Dr. Math, I am doing a 7th grade scavenger hunt for math. I have done almost everything except one problem, which is as follows: What two numbers - neither of them containing zeros - can be multiplied together to make 5,000,000,000? I have tried everything, but I always come up with a zero in the answer. Please help me.
Date: 01/05/2002 at 17:09:00 From: Doctor Jaffee Subject: Re: Very big problem. Hi Jessica, Here's a suggestion. Factor your number completely. When you are finished, you will have nothing but 2's and 5's. Multiply all of the 2's together, then multiply all of the 5's together. You now have two numbers that satisfy the requirements of the problem. Give it a try and if you want to check your solution with me, write back. If you are having difficulties, let me know and show me what you have done so far, and I'll try to help you some more. Good luck. - Doctor Jaffee, The Math Forum http://mathforum.org/dr.math/
Search the Dr. Math Library:
Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.