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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Stone Age Counting

Do you think the lengths of the lines mean something?

Why do you think some of the drawings have curved lines?

What are the similarities and differences between the drawings?

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Age 5 to 7

Challenge Level

- Problem
- Getting Started
- Student Solutions
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Do you think the lengths of the lines mean something?

Why do you think some of the drawings have curved lines?

What are the similarities and differences between the drawings?

Can you design a new shape for the twenty-eight squares and arrange the numbers in a logical way? What patterns do you notice?

Lee was writing all the counting numbers from 1 to 20. She stopped for a rest after writing seventeen digits. What was the last number she wrote?