1. Number
Middle Years
1.07 Prime factorisations
Interactive practice questions
Select all the prime numbers from each of these lists:
a
$3$3
A
$10$10
B
$12$12
C
$4$4
D
$5$5
E
$6$6
F
b
$14$14
A
$7$7
B
$15$15
C
$16$16
D
$13$13
E
$11$11
F
c
$21$21
A
$19$19
B
$27$27
C
$17$17
D
$22$22
E
$1$1
F
Easy
Approx a minute
A number has the following factor tree:
A number has the following factor tree:
This question is about prime factorisations, and the difference between index form and expanded form.
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