Prime and Composite Numbers
In this tutorial the students will learn how to classify the numbers from 1-100 as Prime, Composite or Neither. Prime number have exactly 2 factors, 1 and itself. Composite numbers have more than 2 factors.
Have exactly 2 factors, 1 and itself
Have more than 2 factors
Rules on how to find out if a number is a divisor without having to do the divison.
1: All numbers are divisible by 1. 2: All even numbers. Even numbers have a 0,2,4,6, or 8 in the ones place. 3: The sum of the digits of the number is divisible by 3. 4: If the last 2 digits of the number are divisible by 4. 5: The digit in the ones place is a 5. 6: If the number is divisible by both 2 and 3. 8: If the last 3 digits of the number are divisible by 8. 9: If the sum of the digits of the number are divisible by 9.