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two knots

You can see how many loops of string were used to make these string patterns because the strings are different colours.

In the next pictures can you work out how many loops were used?

three more knots

How many pieces of string do you need to make this string pattern?

tangle of string

Can you explain how you decided?
Here is a pdf  of the string images which you could print off if you find it easier to work on paper.

If you enjoyed this problem, you might like to have a go at How Many Pieces This Time?