Prove It! - Math Worksheet With Answers

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Prove It!

Rule: A number is a multiple of 9 if the sum of its digits is 9. Prove it!

Write five digits whose sum is 9.

Use the five digits in any order to create a five-digit number.

Divide that number by 9. Is there a remainder?

Now write six digits whose sum is 9.

Use the six digits in any order to create a six-digit number.

Divide that number by 9. Is there a remainder?

Use the rule above to write a seven-digit number that is a multiple of 9.

Does the order of digits matter in the rule for 9? Explain.

Is there any digit 0–9 that CANNOT be the final digit in a number that is a multiple of 9?

Why or why not?

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Parent category: Education