list of prime and composite numbers from 1 to 100

The fast way to do this problem is to use the divisibility rule add the digits of each number looking for the one that is not a multiple of three. Which of the following numbers is not divisible by 3? The rules cover division by numbers 2–10 and allow you to check numbers up through 100. The divisibility rules can help you determine if a number is prime or composite as well as help you break composite numbers into their prime factors, the topic we will cover next.ĭivisibility rules are shortcuts to tell you if one number is divisible by another number. Cool Rulesĭivisibility rules are tools to help you do less division. Forty-one is a prime number the other numbers are composite.

Which of the following is a prime number? (A prime number has exactly two factors, so one can’t be prime.)Ī typical test question would have you identify which number from a list is prime (or composite or neither). But duplicate factors are only counted once, so one only has one factor. The only way to get a product of one is by multiplying 1 x 1. A composite number must have a finite number of factors. Since any number times zero equals zero, there are an infinite number of factors for a product of zero.

All even numbers (except the number two) are composite, since they can all be divided by two. This is one of the remaining big math mysteries out there for mathematicians.Ĭomposite numbers have more than two factors but not an infinite number of factors. There is no pattern for finding all of the prime numbers that exist, although mathematicians have found prime numbers with almost eight million digits. If you know your divisibility rules (covered in the next section), then determining the prime numbers from 1–100 is a relatively easy task. Prime numbers have exactly two factors, one and the number itself. Let’s take a look at the difference between prime and composite numbers. We’ve also discussed the various properties of addition and multiplication.Īll whole numbers are categorized as either prime or composite, with the exceptions of zero and one, which are special cases.

So far, we’ve covered the various types of numbers (real numbers, rational numbers, irrational numbers, whole numbers, and integers), as well as how they relate to each other using the common device of a number line.We’ll also review some handy rules that make division faster and easier. In this lesson we will review prime and composite numbers. ⬅ Previous Lesson Workshop Index Next Lesson ➡

List of prime and composite numbers from 1 to 100