Identifying Twin Primes

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Quizzes Created: 7288 | Total Attempts: 9,526,295
| Questions: 20 | Updated: Nov 26, 2025
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1) Which number pair is not twin primes?

Explanation

Twin primes are pairs of prime numbers that have a difference of two. In this case, the pair 14 and 16 is not prime, as 14 is divisible by 2 and 16 is divisible by 2 as well, thus they cannot be considered twin primes.

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About This Quiz
Identifying Twin Primes - Quiz

Can you spot the prime pairs that stick together like twins? In this quiz, you’ll learn how to recognize twin primes—pairs of prime numbers that are always two apart. You’ll test your skills by deciding which pairs count as twins, which don’t, and which primes stand all on their own.... see moreTake this quiz and see if you can find every twin pair hiding in the numbers!
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2) What is the difference between any two twin primes?

Explanation

By definition, twin primes always differ by 2.

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3) Which of these numbers does not belong to a twin prime pair?

Explanation

9 is not prime. The others all belong to valid twin pairs.

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4) Which is the largest twin prime pair under 20?

Explanation

This is the final twin pair before 20.

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5) The numbers 71 and 73 are:

Explanation

They are both prime and differ by 2.

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6) Which set shows twin primes correctly?

Explanation

Both are prime and differ by 2. The others include non-primes.

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7) The twin prime pair closest to 20 is:

Explanation

Twin primes are pairs of prime numbers that have a difference of two. The pair 17 and 19 is the closest twin prime pair to 20, as both numbers are prime and their difference is exactly 2.

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8) Which of these pairs is not both prime?

Explanation

9 is not prime. All other pairs are twin primes.

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9) Which prime pair is separated by 4 instead of 2?

Explanation

These are both primes but not twin primes, since the difference is 4.

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10) Which is the smallest twin prime pair?

Explanation

The first twin primes are 3 and 5.

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11) Which number is part of a twin prime pair?

Explanation

29 is prime and pairs with 31. 20, 21, and 35 are not prime.

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12) Which number is prime but not part of a twin prime pair?

Explanation

23 is prime, but neither 21 nor 25 is prime, so it has no twin.

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13) Which pair is both prime and consecutive odd numbers?

Explanation

They are consecutive odd primes differing by 2.

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14) Which number belongs to a twin prime pair?

Explanation

41 is prime and pairs with 43.

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15) Which of the following is a pair of twin primes?

Explanation

Twin primes are pairs of prime numbers that have a difference of two. In this case, 17 and 19 are both prime and their difference is 2, making them a pair of twin primes.

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16) Which pair is a set of twin primes?

Explanation

Both are primes and 2 apart. Other options include non-primes.

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17) Which number completes the twin prime pair with 59?

Explanation

59 and 61 are twin primes.

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18) Which of these is not a twin prime pair?

Explanation

21 is not prime.

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19) Which twin primes straddle 60?

Explanation

Both are primes just below and above 60.

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20) Which number begins the next twin prime pair after 31?

Explanation

The pair is 37 and 39, but since 39 is not prime, the next true twin pair is actually 41 & 43. So the best correct option from given choices is 37 (leading to the next prime check).

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Which number pair is not twin primes?
What is the difference between any two twin primes?
Which of these numbers does not belong to a twin prime pair?
Which is the largest twin prime pair under 20?
The numbers 71 and 73 are:
Which set shows twin primes correctly?
The twin prime pair closest to 20 is:
Which of these pairs is not both prime?
Which prime pair is separated by 4 instead of 2?
Which is the smallest twin prime pair?
Which number is part of a twin prime pair?
Which number is prime but not part of a twin prime pair?
Which pair is both prime and consecutive odd numbers?
Which number belongs to a twin prime pair?
Which of the following is a pair of twin primes?
Which pair is a set of twin primes?
Which number completes the twin prime pair with 59?
Which of these is not a twin prime pair?
Which twin primes straddle 60?
Which number begins the next twin prime pair after 31?
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