Grade 4 Math · Prime and Composite Numbers
Build Grade 4 Math skills with five 10-question practice tests on prime and composite numbers, factor trees, prime factorization, divisibility, and factor pairs.
These Grade 4 Math practice tests help students classify whole numbers by their factors. Students identify prime and composite numbers, build factor trees, write prime factorizations, use divisibility rules, and apply factor reasoning to equal groups and schedules.
List factor pairs to classify a number. A prime number has exactly two positive factors: 1 and itself. A composite number has more than two positive factors. Remember that 1 has only one positive factor, so it is neither prime nor composite.
For more Grade 4 Math practice, return to the Grade 4 Math category.
1. Test
A 10-question Grade 4 Math practice test on prime and composite numbers, factor trees, prime factorization, divisibility, and factor pairs.
List factor pairs, test divisibility, and decide whether a number has exactly two factors, more than two factors, or only one factor.
Please select an answer first.
Correct answer: A
The correct answer is .
13 has exactly two positive factors: 1 and 13.
Please select an answer first.
Correct answer: B
The correct answer is .
18 has more than two factors, including 1, 2, 3, 6, 9, and 18.
Please select an answer first.
Correct answer: C
The correct answer is .
29 has exactly two positive factors: 1 and 29.
Please select an answer first.
Correct answer: D
The correct answer is .
35 has factors 1, 5, 7, and 35, so it is composite.
Please select an answer first.
Correct answer: A
The correct answer is .
31 is divisible only by 1 and 31, so it is prime.
Please select an answer first.
Correct answer: B
The correct answer is .
1 has only one positive factor, so it is neither prime nor composite.
Please select an answer first.
Correct answer: C
The correct answer is .
The factor pairs are and ; the full list is 1, 3, 5, 15.
Please select an answer first.
Correct answer: D
The correct answer is .
, so 4 and 7 form a factor pair.
Please select an answer first.
Correct answer: A
The correct answer is .
47 has no positive factors other than 1 and 47.
Please select an answer first.
Correct answer: B
The correct answer is .
49 has factors 1, 7, and 49, so it is composite.
A prime number is a whole number greater than 1 with exactly two positive factors: 1 and the number itself.
A composite number is a whole number greater than 1 with more than two positive factors.
The page includes five mini tests with 10 questions each, for 50 Grade 4 Prime and Composite Numbers questions in total.
