Remember: A factor pair is two numbers that multiply to make a number. A prime has only two factors, 1 and itself. A multiple is on the number's times table.
Tiles and partners
1
12 tiles are in 4 equal rows. How many tiles are in each row? 4 × = 12
2
30 tiles are in 5 equal rows. How many tiles are in each row? 5 × = 30
3
Which array shows 24 tiles?
ABC
4
6 × = 24
5
Is 15 a multiple of 5?
YesNo
6
Is 25 a multiple of 8?
YesNo
All the factors
7
32 tiles are in 4 rows of 8. Which number is also a factor of 32?
641116
8
Join each number to its factor pairs.
112
210
316
47
A1 × 10, 2 × 5
B1 × 7
C1 × 16, 2 × 8, 4 × 4
D1 × 12, 2 × 6, 3 × 4
9
Is 35 prime, composite or neither?
PrimeNeitherComposite
10
20 tiles make rectangles 1 by 20, 2 by 10 and 4 by 5. How many factors does 20 have?
11
Every prime number has exactly two factors.
TrueFalse
12
Put the numbers in order from the fewest factors to the most factors.
7
12
9
16
13
Show that 28 is not a prime number. Write two factors other than 1 and 28.
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