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You will need to put each of your data points on the graph.
If we are looking at something that was once living like a fish, dinosaur, tree, or human they may choose to use Carbon, the element found in all living things.
If they are faced with estimating the age of something that is not living, they would need to use a different radioactive element that the item contains.
Reading these two paragraphs will explain why the students are asked to find percentages and will relate what they do in the activity to what scientists have to do in the real world.
Once the teacher has read this section to them, the students may continue working independently.