Remember: Factors come in pairs, but a pair like 6 × 6 gives only one factor. A prime has exactly two factors. A multiple is on the number's times table.
Partners and multiples
1
54 tiles are in 6 equal rows. How many tiles are in each row? 6 × = 54
2
Look at the table of rectangles that 36 tiles make. 4 × = 36
3
Is 48 a multiple of 6?
YesNo
4
Mr. Lee has 42 chairs. He wants equal rows with none left over. Which number of rows can he NOT make?
7 rows6 rows5 rows3 rows
5
Clue: I am a multiple of 7, a factor of 56, and more than 8 and less than 20. What number am I?
How many factors?
6
The table shows the rectangles 36 tiles can make. How many factors does 36 have?
7
49 tiles make a square, 7 rows of 7. How many factors does 49 have?
8
Which is NOT a factor pair of 30?
4 × 83 × 105 × 6
9
Which number is prime?
21332939
10
91 is a prime number.
TrueFalse
11
Put the numbers in order from the fewest factors to the most factors.
13
49
36
30
12
Join each number to how many factors it has.
17
225
316
424
A2 factors
B5 factors
C3 factors
D8 factors
13
Pip says every even number is composite. Is Pip right? Write what you know about the number 2.
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