Worksheet 1 Input and output

The larger wheel had a handle

The pupils counted how many full turns the smaller cog made each time the larger one turned a number of full turns.

For example, when the large cog turned 8 times, the small cog turned 40 times.

Here are the results from 8 different groups of pupils. In each pair the number of turns of the large cog is written first.

8,40  3,15  6,30  2,10  5,25  7,35  1, 5  4,20

1. How can you make sense of these results mathematically

2.What idea did you use in filling in the table?

3. What pattern(s) can you see in the results?