Exploring the Magic of Number Nine

Exploring the Magic of Number Nine

Assessment

Interactive Video

Mathematics, English, Science

5th - 8th Grade

Hard

Created by

Liam Anderson

FREE Resource

This video tutorial introduces a fascinating math pattern involving the number nine. It guides viewers through a series of steps: selecting a number greater than 11, rearranging its digits, subtracting the smaller number from the larger, and adding the digits of the result. The sum of these digits will always reduce to nine, even if it requires multiple additions. The tutorial demonstrates this pattern with examples, including larger numbers, to illustrate its consistency and reliability.

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5 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in discovering the math pattern involving the number nine?

Select a whole number less than 11

Select a whole number more than 11

Select a number with even digits

Select any prime number

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

After rearranging the digits of a number, what should you do next?

Multiply the digits

Divide the digits

Add the digits

Subtract the smaller number from the larger

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result when you add the digits of the difference obtained in the pattern?

A number greater than nine

Nine

A prime number

The original number

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When applying the pattern to larger numbers, what might you need to do to reach a sum of nine?

Multiply the digits

Add the digits more than once

Divide the digits

Subtract the digits

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If the sum of the digits of the difference is 18, what should you do next?

Add the digits again

Subtract the digits

Divide the digits

Multiply the digits