This math topic practices identifying prime numbers from pairs of given numbers. Each problem presents two numbers and asks which one is a prime number. The skill of recognizing prime numbers is central here, which is a foundational concept in the broader study of factoring and identifying the greatest common factors. The questions involve comparisons within the pairs such as "79, 85" or "53, 55," where the learner must determine which number is prime.
Work on practice problems directly here, or download the printable pdf worksheet to practice offline.
moreWhich Number of a Pair is Prime Worksheet
| Math worksheet on 'Which Number of a Pair is Prime (Level 5)'. Part of a broader unit on 'Factoring and Lowest Common Multiple - Practice' Learn online: app.mobius.academy/math/units/factoring_and_lowest_common_multiple_practice/ |
1
| Which of these two numbers is a prime number? |
| 65,71 |
a
| 65 |
b
| 71 |
2
| Which of these two numbers is a prime number? |
| 105,109 |
a
| 105 |
b
| 109 |
3
| Which of these two numbers is a prime number? |
| 107,111 |
a
| 107 |
b
| 111 |
4
| Which of these two numbers is a prime number? |
| 99,103 |
a
| 99 |
b
| 103 |
5
| Which of these two numbers is a prime number? |
| 57,61 |
a
| 57 |
b
| 61 |
6
| Which of these two numbers is a prime number? |
| 59,63 |
a
| 59 |
b
| 63 |
7
| Which of these two numbers is a prime number? |
| 67,82 |
a
| 67 |
b
| 82 |