Elementary Number Theory Facts

Number Theory

This quiz covers fundamental concepts in number theory suitable for elementary school students, focusing on prime numbers, factors, multiples, and basic divisibility rules.

prime numbers factors multiples divisibility even and odd numbers

18 Questions Medium Ages 5+ Jul 21, 2026

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About this Study Set

This study set covers Number Theory through 18 practice questions. This quiz covers fundamental concepts in number theory suitable for elementary school students, focusing on prime numbers, factors, multiples, and basic divisibility rules. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 18 questions from the Elementary Number Theory Facts study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which of these numbers is a prime number?

A 6
B 9
C 7
D 10

2 What is the smallest even number greater than 1?

3 Which number is a factor of both 12 and 18?

A 4
B 6
C 8
D 10

4 What is the first multiple of 5 that is greater than 20?

A 21
B 25
C 30
D 35

5 A number that can be divided exactly by 2 is called:

A Odd
B Prime
C Composite
D Even

6 How many factors does the number 10 have?

7 Which of these numbers is NOT a prime number?

A 11
B 13
C 15
D 17

8 What is the greatest common factor (GCF) of 8 and 12?

9 Which number is a multiple of 7?

A 13
B 20
C 28
D 32

10 The number 1 is:

A Prime
B Composite
C Neither prime nor composite
D Both prime and composite

11 Which number has factors 1, 2, 5, and 10?

A 8
B 12
C 15
D 10

12 What is the smallest composite number?

13 If a number ends in 0 or 5, it is divisible by:

A 2
B 3
C 5
D 10

14 What is the least common multiple (LCM) of 3 and 4?

A 7
B 10
C 12
D 24

15 Which of these numbers is an odd number?

A 14
B 17
C 22
D 30

16 A number that has more than two factors is called:

A Prime
B Even
C Odd
D Composite

17 The number 2 is:

A Odd
B Composite
C Prime
D Neither prime nor composite

18 What is the sum of the first two prime numbers?

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