Question: Carrie wanted to find out which was harder, a penny or a nickel, so she did a scratch test. How would this tell her which is harder?
Reference answer: The harder coin will scratch the other.

Student answer: You could tell if it has the hardest if most of it came off.

Student answer: If just the penny could scratch and the nickel could not the penny is harder.

Student answer: Whichever one was damaged most was less hard.

Student answer: Rub them against a crystal.

Student answer: Which had less scratches.

Student answer: If it makes a scratch or a little dent.

Student answer: Well she can take the penny and the nickel and rub them together.

Student answer: The one that is scratched is softer.

Student answer: She could tell which is harder by getting a rock and seeing if the penny or nickel would scratch it. Whichever one does is harder.

Student answer: Maybe he should scratch even other then when you are done see if one have scratches.

Student answer: It would tell her because she could scratch the penny on the nickel and the nickel on the penny and see which one is scratched.

Student answer: In order to tell which is harder, else would have to see if the penny and nickel leave a mark to see which is harder.

Student answer: By the one that leave a mark on one. That means that that one is harder.

Student answer: The one that got scratch each penny or a nickel got scratch.

Student answer: She can scratch it and see which one scratch the rock or mineral.

Student answer: If the penny gets scratched the nickel is harder and if the nickel gets scratched then the penny is harder.

Student answer: The nickel is the hardest because is you scratch it with a penny it will not scratch but the nickel could because it is so much.

Student answer: You get a penny or a nickel if one of them scratches the metal it is hard.

Student answer: She would know because the one that is scratched is the one that is least hard and the one that is not scratched is the one that is hardest.

Student answer: How you would know that one of them is harder is for say if the nickel never a scratch the penny, and the penny got scratch by the nickel then the nickel would be harder than the penny that is how you would which one is harder.

Student answer: The one that got a scratch is not hard.

Student answer: A paperclip is harder.

Student answer: The one that is harder will scratch the less harder one.

Student answer: I do not know.

Student answer: Fire.

Student answer: The nickel because it is bigger and it harder.

Student answer: By using your hand.

Student answer: If it left a scratch.

Student answer: I do not know.

Student answer: The nickel is the heavier and the penny is the lighter.

Student answer: You can rub the penny and the nickel together. The one with the mark and a scratch is the least hardest the one with no mark or scratch is the hardest.

Student answer: Because of it he you scratch with a penny.

Student answer: Rub them together and whichever one has a scratch or a mark the is softer and the one that has nothing on it is harder.

Student answer: Rub to penny with nickel and whichever one had a scratch is some.

Student answer: She would scratch the rocks together the one that scratches is softer.

Student answer: Nickel is harder.