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Number sequences sometimes use rules to generate the next number.

 

Here is a simple rule:

 

If the number is even, divide it by 2.

If the number is odd, subtract 1 from it.

Stop when you get to the number 1.

 

Look at this number worm, which shows this rule starting at the number 60.

 

Number worm

 

That's quite a worm! Did you see how it follows the rule all the way from 60 to 1?

 

happy girl

 

Let's have a go at some more number worms now.

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