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How many keys can you nd on this page?
Do you have private stuff that you don’t want your little brother or sister to get into? How can you keep others out of your private stuff? This is not a new problem. For thousands of years, people have looked for ways to keep things safe from others.
Long ago, people used a broken clay coin to find out who had permission to get certain things and information.
Can you draw lines to connect each piece of coin to another to create whole coins?
Say your uncle had a treasure saved just for you, but he had not seen you since you were a baby. Your uncle would need a way to know that it was really you coming to get the treasure.
One way to do this was with a broken coin. When you were a baby, he would have given you half of the coin and kept the other half for himself. (Well, since you were a baby, he would have given it to someone to save for you.) Then, when you showed up years later to get your treasure, you would show your half of the coin. If it matched the half your uncle had, the treasure would be yours!
Standards Link: Geometry: Students make a direct comparison with reference objects.
Today, people use locks with keys or combinations to keep things safe.
1.
No two numbers are the same. There are three odd numbers. The only even number is greater than 6.
To unlock this safe, you must figure out which combination will work. Read the clues and see if you can “unlock” this mystery!
2. 3.
Standards Link: Mathematical Reasoning: Analyze problems by identifying relationships and sequencing information; check validity of results from context of the problem.
© Vicki Whiting December 2025
familyresourcegroupinc.com
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