Numbers and sequences

Common multiples & factors

Name: ______________________________Date: ______________Score: ______ / 20

1.
Which of these is a multiple of 3?
1. A12
2. B14
3. C20
4. D22
2.
Anna's number is a multiple of 3 and 5 and is less than 20. What is her number?
3.
Write the smallest number bigger than 100 that is a multiple of both 3 and 5.
4.
Which are the common multiples of 3 and 8 that are less than 50?
1. A24 and 48
2. B16 and 32
3. C8 and 24
4. D12 and 48
5.
From 5, 14, 15, 18, 20, 21, 24, 29, 30, 60, which are the common multiples of 2, 3 and 5?
1. A30 and 60
2. B15 and 30
3. C20 and 60
4. D24 and 30
6.
What is the largest factor of 18 that is not 18 itself?
7.
Which numbers are the common factors of 18 and 24?
1. A1, 2, 3, 6
2. B1, 2, 4, 8
3. C2, 3, 6, 9
4. D1, 3, 6, 9
8.
10 is a common factor of 30 and 20.
True False
9.
Pierre shares 32 cards equally so every friend gets the same whole number. Which number of friends works?
1. A8
2. B5
3. C6
4. D7
10.
Which of these is a common multiple of 3 and 7?
1. A21
2. B24
3. C28
4. D35
11.
A common factor of two numbers divides exactly into both of them.
True False
12.
Which word describes the answers in a number's times-table?
1. AMultiples
2. BFactors
3. CDigits
4. DTerms
13.
List the factors of 20. How many factors does it have?
14.
Name a factor of 17 that is greater than 1 and less than 17. (17 works — type 17.)
15.
81 is a multiple of 8.
True False
16.
120 ÷ 12 = ?
17.
Name a factor of 24 that is greater than 1 and less than 24. (4 works — type 4.)
18.
29 is a multiple of 7.
True False
19.
81 ÷ 9 = ?
20.
Select all the COMMON factors of 12 and 18.
- A2
- B3
- C4
- D6
- E9
- F12

Answer key

Numbers and sequences — Common multiples & factors

1.A. 12
2.15
3.105
4.A. 24 and 48
5.A. 30 and 60
6.9
7.A. 1, 2, 3, 6
8.True
9.A. 8
10.A. 21
11.True
12.A. Multiples
13.6
14.17
15.False
16.10
17.4
18.False
19.9
20.A. 2; B. 3; D. 6