Video Definition 12--Primes and Composites--Divisibility Rule for 9

Topic

Prime and Composite Numbers

Description

Divisibility by 9: A number is divisible by 9 if the sum of its digits is divisible by 9. For example, 990 and 1,575 are divisible by 9 because the sum of their digits equals 18, which is divisible by 9. This rule emphasizes another numerical pattern, connecting to the broader understanding of divisibility and primes.

The mathematics behind this topic provides a foundation for understanding how numbers interact with one another. By exploring the patterns and properties of prime and composite numbers, students can develop critical thinking and problem-solving skills.

Teacher's Script: Let’s explore an important concept that involves classifying numbers based on their factors. This concept will help us understand how numbers are built and how they can be broken down into their basic building blocks. Pay attention to the visuals and explanations to see how these ideas connect to everyday math!

For a complete collection of videos related to Prime and Composite Numbers click on this link: Math Video Definitions: Primes and Composites Collection.