Answer :

40
4* 10
2*2*5*2

therefore prime factors are : 2x2x2x5
naǫ
[tex]40 | \div 2 \\ 20 | \div 2 \\ 10 | \div 2 \\ 5 \\ \\ \boxed{40=2 \times 2 \times 2 \times 5}[/tex]

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