What is the smallest number that has two and five as factors?
Yes,
ten.
How about the smallest number with
two,
three and
five as factors?
Yes, thirty. (Mr Gregg had cut some special thirty-rods.)
We had no fifteen rods. Can you see how we've made fifteen?
Oops, we've missed one... six is a factor too!
Now let's make a factor tree of thirty...
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