Prime Number Calculator

A prime number is a number which has exactly two factors i.e. ‘1’ and number itself. A composite number has more than two factors, which means apart from getting divided by number 1 and itself, it can also be divided by at least one integer or number. We don’t . Summary: A prime number has only two factors: 1 and itself. A composite number has more than two factors. The number 1 is neither prime nor composite. The prime numbers between 2 and 31 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 since each of these numbers has only two factors, itself and 1.

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Forgot my password. Prime and Composite Find factors to determine if the number is prime or composite. Check my answers. Email my answers to my teacher. Math Module 3 Lesson 25 by ajuhl. Prime-Composite Graded Classwork by laurenathey.

What is a Prime Number?

A prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself. The numbers 0 and 1 are neither prime nor composite. All even numbers are divisible by two and so all even numbers greater than two are composite numbers. Q. Composite numbers: answer choices. Are always bigger than prime numbers. Have more than 2 factors. Have 2 pairs of factors. Don't have factors. Are always bigger than prime numbers. alternatives. Have more than 2 factors. Prime and Composite Find factors to determine if the number is prime or composite ID: Language: English School subject: Math Grade/level: 4 Age: Main content: Prime and Composite Other contents: Add to my workbooks (25) Embed in my website or blog Add to Google Classroom.

Problem 1: The area of a rectangular garden is 7 square yards. List all possible whole-number dimensions the garden can have. The whole-number dimensions, 1 and 7, of the rectangular garden above, are the factors of the number 7. Problem 2: The area of a rectangular garden is 8 square yards. The whole-number dimensions, 1, 2, 4 and 8, of the rectangular gardens in Problem 2, are the factors of the number 8. In Problem 1, the number 7 has only two factors.

The number 7 is prime. In problem 2 above, the number 8 has four factors. The number 8 is composite. When the area of a rectangle is a prime number, there is only one set of possible dimensions for that rectangle. When the area of a rectangle is a composite number, there are two or more sets of possible dimensions for that rectangle.

Each set of dimensions is a pair of factors. We have determined if a single number is prime or composite. Let's look at a range of numbers to see if they are prime or composite. Please note that each range of numbers given in Examples 3, 4 and 5 below are inclusive.

Solution: The prime numbers between 2 and 9 are 2, 3, 5 and 7. Solution: The prime numbers between 10 and 19 are 11, 13, 17 and Solution: The prime numbers between 20 and 29 are 23 and Example 6: Is the number 31 prime or composite?

Explain your answer using full sentences. Solution 2: Thirty-one is a prime number. This is because the number 31 has only two factors: 1 and Solution 3: I divided the number 31 by all numbers between 1 and 31 and found no factors other than one and thirty-one.

Therefore, 31 is prime. There are many possible ways to explain the solution to this problem. These are just three possible explanations. Summary: A prime number has only two factors: 1 and itself. A composite number has more than two factors.

The number 1 is neither prime nor composite. The prime numbers between 2 and 31 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 since each of these numbers has only two factors, itself and 1. Directions: Read each question below. Select your answer by clicking on its button. If you make a mistake, choose a different button.

Shop Math Games. Skip to main content. Search form Search. Solution: 1 yd x 7 yd The whole-number dimensions, 1 and 7, of the rectangular garden above, are the factors of the number 7.

Solution: 1 yd x 8 yd, 2 yd x 4 yd The whole-number dimensions, 1, 2, 4 and 8, of the rectangular gardens in Problem 2, are the factors of the number 8. Definitions A prime number has only two factors: 1 and itself. To determine if a number is prime or composite, follow these steps: Find all factors of the number. If the number has only two factors, 1 and itself, then it is prime. If the number has more than two factors, then it is composite. Example 1: Is the number 2 prime or composite?

Solution: The factors of 2 are 1 x 2. Example 2: Is the number 9 prime or composite? Solution: The factors of 9 are 1 x 9, 3 x 3. Example 3: Find all prime numbers between 2 and 9. Example 4: Find all prime numbers between 10 and Example 5: Find all prime numbers between 20 and Solution 1: The number 31 is prime because its only factors are one and itself. Exercises Directions: Read each question below.

The prime numbers between 40 and 49 are: 42, 43 and 47 41, 43 and 47 43, 45 and 47 None of the above. The prime numbers between 50 and 59 are: 53 and 59 51 and 59 53 and 57 None of the above. The prime numbers between 60 and 69 are: 63 and 69 61 and 67 60 and 65 None of the above.

The prime numbers between 20 and 69 are: 21, 23, 29, 31, 37, 41, 43, 47, 53, 63 and 69 23, 29, 31, 33, 37, 41, 43, 47, 59, 61 and 67 23, 29, 31, 37, 41, 43, 47, 53, 59, 61 and 67 None of the above. Elementary Math Lessons. Factors and GCF. Multiples and LCM. Primes and Composites.

Divisibility Rules. Patterns and Exponents. Practice Exercises. Challenge Exercises. Exponents and Scientific Notation. Factor Tree Game. Number Theory WebQuest. Pre-Made Worksheets. Square Root Calculator. Word Search Puzzle.

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