Download Recall Worksheet R 3.5 Prime factors A factor tree is a useful way of

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Recall Worksheet R 3.5
Prime factors
A factor tree is a useful way of finding the prime factors of a composite number.
1
Complete the following factor trees and then express the number on top of the tree as a product of its
prime factors in index form.
(a)
(b)
18
……
6
……
 18 = 2  ……  3 = ……
(c)
……
6
……
2
12
3
……
2
 24 = …… 3  2  …… = ……
(d)
……
……
24
72
2
9
……
……
8
……
……
2
 12 = ……  ……  2 = ……
……
……
 72 = ……  ……  2  ……  ……
= ……
(e)
30
……
6
……
(f)
……
 30 = ……  ……  ……
= ……
42
……
6
……
……
 42 = ……  ……  ……
= ……
Copyright © Pearson Australia 2011 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 4576 2
1
(g)
600
(h)
6
……
100
……
……
10
3
10
…… 2
148
2
……
……
5
 600 = ……  ……  2  2  ……  ……
= ……
444
……
 444 = 3  ……  ……  ……
= ……
Copyright © Pearson Australia 2011 (a division of Pearson Australia Group Pty Ltd) ISBN 978 1 4425 4576 2
2
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