Solution 2: Thirty-one is a prime number. Solution 1: The number 31 is prime because its only factors are one and itself.
#List of prime numbers up to 811 full#
Solution: The prime numbers between 20 and 29 are 23 and 29.Įxample 6: Is the number 31 prime or composite? Explain your answer using full sentences. Solution: The prime numbers between 10 and 19 are 11, 13, 17 and 19.Įxample 5: Find all prime numbers between 20 and 29. Solution: The prime numbers between 2 and 9 are 2, 3, 5 and 7.Įxample 4: Find all prime numbers between 10 and 19. Please note that each range of numbers given in Examples 3, 4 and 5 below are inclusive.Įxample 3: Find all prime numbers between 2 and 9. Let's look at a range of numbers to see if they are prime or composite. We have determined if a single number is prime or composite. Solution: The factors of 9 are 1 x 9, 3 x 3.
2 is prime.Įxample 2: Is the number 9 prime or composite?
If the number has more than two factors, then it is composite.Įxample 1: Is the number 2 prime or composite?. If the number has only two factors, 1 and itself, then it is prime. To determine if a number is prime or composite, follow these steps: Each set of dimensions is a pair of factors. When the area of a rectangle is a composite number, there are two or more sets of possible dimensions for that rectangle. When the area of a rectangle is a prime number, there is only one set of possible dimensions for that rectangle. The number 1 is neither prime nor composite. A composite number has more than two factors. A prime number has only two factors: 1 and itself. In problem 2 above, the number 8 has four factors. In Problem 1, the number 7 has only two factors. The whole-number dimensions, 1, 2, 4 and 8, of the rectangular gardens in Problem 2, are the factors of the number 8. List all possible whole-number dimensions the garden can have. Problem 2: The area of a rectangular garden is 8 square yards. The whole-number dimensions, 1 and 7, of the rectangular garden above, are the factors of the number 7. Problem 1: The area of a rectangular garden is 7 square yards.
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