50+ Prime and Composite Numbers worksheets for 6th Year on Quizizz ... - Free Printable

Let’s solve each question one by one with clear explanations.

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1. Which of these numbers is not prime?

Options:
A) 37
B) 17
C) 25
D) 23

✔ Answer: C) 25

Explanation:
A prime number is a number greater than 1 that has no positive divisors other than 1 and itself.
- 37 → prime (only divisible by 1 and 37)
- 17 → prime
- 23 → prime
- 25 → not prime, because 25 = 5 × 5 → it has divisors other than 1 and itself → it’s composite

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2. Name the next 3 prime numbers after 23.

Options:
A) 24, 26, 28
B) 24, 25, 26
C) 29, 31, 37
D) 29, 30, 31

✔ Answer: C) 29, 31, 37

Explanation:
After 23, check each number:
- 24 → even → not prime
- 25 → 5×5 → not prime
- 26 → even → not prime
- 27 → 3×9 → not prime
- 28 → even → not prime
- 29 → prime
- 31 → prime
- 32–36 → all composite
- 37 → prime

So next 3 primes after 23 are 29, 31, 37

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3. Which of the following numbers is not composite?

Options:
A) 61
B) 40
C) 24
D) 66

✔ Answer: A) 61

Explanation:
A composite number is a positive integer with more than two factors (i.e., not prime and not 1).
- 61 → prime → only factors: 1 and 61 → so NOT composite
- 40 → 2×2×2×5 → composite
- 24 → 2×2×2×3 → composite
- 66 → 2×3×11 → composite

So the one that is not composite is 61

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4. Name the 5th prime number.

Options:
A) 11
B) 5
C) 2
D) 7

✔ Answer: A) 11

Explanation:
List the first few prime numbers:
1st → 2
2nd → 3
3rd → 5
4th → 7
5th → 11

So the 5th prime is 11

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5. How many prime numbers are there between 1 and 100?

Options:
A) 50
B) 100
C) 75
D) 25

✔ Answer: D) 25

Explanation:
There are exactly 25 prime numbers between 1 and 100.
They are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 → 25 total

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6. Which is the only prime number that is even?

Options:
A) 22
B) 2
C) 14
D) 17

✔ Answer: B) 2

Explanation:
All even numbers > 2 are divisible by 2 → so they have at least 3 factors (1, 2, and themselves) → composite.
Only 2 is even and prime → because its only factors are 1 and 2.

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7. Number 27 is both ...

*(Note: The question is cut off in your image, but we can infer based on context.)*

Since this is a quiz on Prime and Composite Numbers, and 27 is clearly not prime (27 = 3×3×3), it must be composite.

Also, 27 is odd and a perfect cube (3³).

But since the topic is prime/composite, likely the intended answer is:

✔ Composite (and possibly “odd” or “a multiple of 3”)

If you had to choose from options (which aren’t shown), common answers might be:

> “composite and odd”
> or “not prime”

But since the question is incomplete, I’ll say:

Number 27 is both composite and odd.

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## ✔ Final Answers Summary:

1. C) 25
2. C) 29, 31, 37
3. A) 61
4. A) 11
5. D) 25
6. B) 2
7. Composite and odd *(or as per full question if options were given)*

Let me know if you want the rest of the 15 questions solved too!