Draw a number line and show all numbers that …

… are between 1 and 20 and have exactly 4 factors

5 answers

Just number 16.

16 = 2 ∙ 2 ∙ 2 ∙ 2
That was prime factorisation.

But if you use all numbers 1 ÷ 20 then:

6

1 , 2 , 3 , 6

8

1 , 2 , 4 , 8

10

1 , 2 , 5 , 10

14

1 , 2 , 7 , 4
you forgot 15
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