Multiplying by Nine: Tricks and Techniques

This video tutorial explains a simple trick for multiplying numbers by nine. It covers methods for single-digit, two-digit, and three-digit numbers, using a combination of addition and subtraction. The tutorial provides step-by-step examples to make the process easy to understand and apply. The video concludes with a summary of the trick and encourages viewers to practice and share the method.

What is the first step when multiplying a single-digit number by nine?

• Add one to the number

• Subtract one from the number

• Multiply the number by itself

• Divide the number by two

If you multiply 7 by 9 using the single-digit method, what is the result?

• 72

• 81

• 63

• 56

When multiplying a two-digit number by nine, what is the first step?

• Divide the first digit by two

• Multiply the digits together

• Add one to the first digit

• Subtract one from the first digit

Using the two-digit method, what is the result of multiplying 36 by 9?

• 324

• 360

• 342

• 306

What is the second step in the two-digit multiplication method?

• Subtract the second digit from 9

• Divide the second digit by 9

• Multiply the second digit by 9

• Add the second digit to 9

How do you start the process of multiplying a three-digit number by nine?

• Subtract one from the first two digits

• Divide the first two digits by nine

• Multiply the first two digits by nine

• Add one to the first two digits

What is the result of multiplying 136 by 9 using the three-digit method?

• 144

• 1360

• 122

• 1224

In the three-digit method, what do you do after adjusting the first two digits?

• Add the last digit to 9

• Subtract the last digit from 9

• Divide the last digit by 9

• Multiply the last digit by 9

What is the main benefit of using these multiplication tricks?

• They work for all numbers

• They make calculations faster

• They are more accurate

• They are easier to remember

What should you do to improve your skills in multiplying by nine?

• Avoid using tricks

• Use a calculator

• Memorize all multiplication tables

• Practice regularly