Question

You are just about to teach the prime numbers to the grade 4 class. Explain the strategy you will use to ensure that your learners understand and know the prime numbers between 1 and 100. Use your own words and clear procedure should be explained in full

Answer 1

The first approach to making then understand about prime number is to let them know about the divisibility fact about prime number: A prime number can be divided, without a remainder, only by itself and by 1. For example, 17 can be divided only by 17 and by 1; 41 can only be divided by 1 and itself. Thus, 17 and 41 are prime numbers

Procedure

• The only even prime number is 2. All other even numbers can be divided by 2.
• If the sum of a number's digits is a multiple of 3, that number can be divided by 3.
• No prime number greater than 5 ends in a 5. Any number greater than 5 that ends in a 5 can be divided by 5.
• Zero and 1 are not considered prime numbers.
• Except for 0 and 1, a number is either a prime number or a composite number. A composite number is defined as any number, greater than 1, that is not prime.

To prove whether a number is a prime number, first try dividing it by 2, and see if you get a whole number. If you do, it can't be a prime number. If you don't get a whole number, next try dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a prime number .