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Maths · Grade 4 · Set A
Every factor, and primes
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A
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Goal: 15 min
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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?
A
B
C
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.
  1. 112
  2. 210
  3. 316
  4. 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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Answer key · Set A
Every factor, and primes
13 Count one row: 3 tiles. 4 × 3 = 12, so 3 is the partner of 4.
26 Count one row: 6 tiles. 5 × 6 = 30.
3B Array A has 4 × 5 = 20 tiles, B has 4 × 6 = 24 and C has 5 × 6 = 30.
44 6 rows of 4 tiles make 24.
5Yes Count by 5s: 5, 10, 15. You land on 15, so 15 is a multiple of 5.
6No Count by 8s: 8, 16, 24, 32. You jump over 25, so it is not a multiple of 8.
716 2 × 16 = 32, so 16 is a factor. 64 is a multiple of 32, and 11 does not go into 32.
81-D, 2-A, 3-C, 4-B
9Composite 5 × 7 = 35, so 35 has more than two factors. It is composite.
106 The factors are 1, 20, 2, 10, 4 and 5. Each pair gives two factors, so there are 6.
11True A prime number has just 1 and itself as factors. For example, 7 has only 1 and 7.
121, 4, 2, 3 7 has 2 factors (1, 7), 9 has 3 (1, 3, 9), 16 has 5 (1, 2, 4, 8, 16) and 12 has 6 (1, 2, 3, 4, 6, 12).
13Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.