Master the complete set of divisibility shortcuts to check numbers instantly.
Don’t include any symbols.

🙂 = Correct, ☹️ = Incorrect

📌 Rules

• Divisibility rules are quick checks to see if a whole number divides equally into groups without doing long division. Imagine sharing 123480 marbles into equal bags.

• Test for 4: Look at the last two digits on the right. For 123480, the last two digits make 80. Since 80 is in the 4 times table (4 × 20 = 80), the whole number 123480 is divisible by 4.

• Test for 9: Add all digits together just like the rule for 3. For 123480, doing 1 + 2 + 3 + 4 + 8 + 0 gives 18. Because 18 is in the 9 times table, 123480 is divisible by 9.

• On our online platform, entering your answers is quick and smooth because the numerical fields only accept plain digits. Just type 123480 with no spaces and no commas.

💡 Tips

• Test for 2, 5, and 10 by checking only the last digit: even numbers (0, 2, 4, 6, 8) divide by 2, numbers ending in 0 or 5 divide by 5, and numbers ending in 0 divide by 10. Since 123480 ends in 0, it passes all three tests automatically.

• Test for 6 and 12 by combining rules: a number divisible by both 2 and 3 is divisible by 6. A number divisible by both 3 and 4 is divisible by 12, exactly like 123480.

⚠️ Warnings

• Do not use the digit-sum method for 4, 8, 5, or 10. Adding up digits only works for 3 and 9. For 4, always check the last two digits instead.

• Never add spaces or commas when typing numbers on our platform. Leaving out punctuation and entering 123480 as plain digits ensures your input is processed smoothly.