What Are Divisibility Rules?
Divisibility rules are special shortcuts that help us quickly figure out if one number can be divided by another without leaving a remainder.
They're like magic math tricks that make division problems much easier! Today we'll learn rules for numbers 2 through 10.
The Rules Explained
Rule for 2
A number is divisible by 2 if its last digit is even (0, 2, 4, 6, or 8).
Rule for 3
A number is divisible by 3 if the sum of its digits is divisible by 3.
Rule for 5
A number is divisible by 5 if it ends with 0 or 5.
Let's Practice Together!
Example 1: Is 126 divisible by 3?
Let's use the rule for 3:
1. Add the digits: 1 + 2 + 6 = 9
2. Is 9 divisible by 3?
Yes! 9 ÷ 3 = 3 with no remainder, so 126 is divisible by 3!
Example 2: Test Your Own Number
Enter any number:
Check if it's divisible by:
Parent Tips 🌟
- Play the "Divisible or Not" game during car rides - call out numbers and have your child shout if they're divisible by 2, 3, or 5.
- Use real-life examples like sharing cookies equally to demonstrate why divisibility matters.
- Create a divisibility rules chart together and decorate it with your child's favorite colors and stickers.