# Divisible rules for 3 and 9 in a relationship

### Divisibility Rules for 3 and 9

A listing of divisibility rules with illustrated examples and explanations. Know divisibility rules from 2 to 10 with examples. Download FREE divisibility rules pdf chart, flash cards and math worksheets for rules on. In this post we are going to learn about the criteria of divisibility by 3, 4, 9 and We will show some example for each case.

How about colorful flash cards to remember these rules? Print the flash cards and cut them to form a card.

Or buy our Dr. Math Flash cards to get the whole printed set that covers various topics of math including divisibility rules. Once your child is well learned about all the divisibility rules, you could see how much can they apply it.

• Divisibility Rules and Finding Factors
• Divisibility Rules
• The Divisibility Rules: 3, 6, 9

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It is a fun way for repetition of divisibility rules and bonding with family over the board games. So, hope these divisibility rules for kids will help your child in solving math problems like a pro. Do share this article with your fellow parents for their benefit.

## Divisibility Rules for 2 3 4 5 6 7 8 9 – Printable Charts & Flash Cards

The Divisibility Rules help us to determine if a number will divide into another number without actually having to divide. There is a divisibility rule for every number. However, some of the rules are easier to use than others. For the rest, it might just be simpler to actually divide. Here is a look at the rules for 3, 6, and 9.

### Divisibility rules

The Rule for 3: A number is divisible by 3 if the sum of the digits is divisible by 3. What does this mean? This means that we need to add up the digits in the number and see of the answer is can be divided by 3 without a remainder. Add up the digits. Determine if 3 divides evenly into the sum of So 3 goes evenly into Use the result to determine if 3 goes into 34, Because 3 divides into 18 evenly, 3 also divides evenly into 34, Is the number prime or composite?

We used the procedure listed below. 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.

The above procedure works very well for small numbers. Thus we need a better method for determining if a large number is prime or composite.

Every number has one and itself as a factor. Thus, if we could find one factor ofother than 1 and itself, we could prove that is composite. One way to find factors of large numbers quickly is to use tests for divisibility. If one whole number is divisible by another number, then the second number is a factor of the first number.