Divisibility rules are shortcuts to help you figure out if a number can be divided evenly by another number without actually doing the long division. They're like secret codes that make math easier! Here’s a breakdown of some common divisibility rules:
Divisibility Rules Explained
Here's a table summarizing the divisibility rules that are easy for kids to understand:
| Divisibility by | Rule | Example |
|---|---|---|
| 1 | Every number is divisible by 1. | 10 / 1 = 10 |
| 2 | The last digit is 0, 2, 4, 6, or 8. | 24 (ends in 4) |
| 3 | The sum of the digits is divisible by 3. | 36: 3 + 6 = 9, and 9 is divisible by 3. |
Examples to Help You Understand
- Divisible by 1: Any number, no matter how big or small, can be divided by 1. For example, 10 ÷ 1 = 10.
- Divisible by 2: If a number ends in 0, 2, 4, 6, or 8, it’s divisible by 2. This means it's an even number. For example, 22, 34, and 128 are all divisible by 2.
- Divisible by 3: Add up all the digits in the number. If the sum is divisible by 3, then the whole number is divisible by 3. For example, for the number 123, add 1 + 2 + 3 = 6. Since 6 is divisible by 3, then 123 is also divisible by 3.
By using these simple rules, kids can quickly check if a number is divisible by 1, 2, or 3 without doing long division.
