Grade 7 Mathematics · Strand 1: Numbers · Whole Numbers
Prime Numbers
A short Grade 7 Mathematics lesson for the CBE curriculum, part of Numbers: Whole Numbers. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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1. Which of the following is a prime number?
- A. 51
- B. 57
- C. 59
- D. 91
2. Why is the number 1 not a prime number?
- A. It is an odd number
- B. It has only one factor, not two distinct factors
- C. It is smaller than 2
- D. It is divisible by every number
3. How many prime numbers are there between 1 and 100?
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4. Using the divisibility tests, 143 is composite because it divides exactly by a prime number. Find the smallest prime factor of 143 greater than 7.
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5. What name is given to a whole number greater than 1 that has more than two factors?
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