Can You Balance a Coin on the Edge of a Dollar Bill?
Sounds impossible? Not for you! This one will take a little practice. Here is how:
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Breaking the Underwater Record
Do you like to swim? How long can you stay under water? Houdini is said to have been able to stay under water for 2 minutes. I have been practicing, and–believe it or not–I can actually stay under water for 3 minutes! How is this possible?
Can You Make a Square by Moving Just ONE Crayon?
It’s back to school time, so a challenge using crayons or pencils seems appropriate. Is it really possible to form a square by moving just ONE crayon?
Product = Sum? You Must be Kidding!
What is the only 2-digit number where the product of its digits equals the sum of its digits? E.g. could it be 37? 3×7=21. 3+7=10. These don’t match, so it’s not 37. What is it then?
What’s the Only 2-Digit Number that is Both a Cube and a Square?
There’s one number that equals something multiplied by itself, and something else cubed. Any idea what that special number is?
