Multiplication Methods and Techniques

The video tutorial introduces an alternative method for multiplying numbers by nines, such as 9, 99, and 999. The method involves subtracting one from the first factor and then subtracting the result from the second factor. Three examples are provided to illustrate the method: multiplying by 9, 99, and 999, with detailed steps and results for each case.

What is the first step in the alternative method for multiplying by nines?

• Multiply the first factor by two

• Subtract one from the first factor

• Divide the first factor by nine

• Add one to the first factor

In the first example, what is the result after subtracting from the second factor?

• Zero

• Nine

• Three

• Six

For the second example, what is the product of 20 and 99 using the method?

• 2000

• 1980

• 2079

• 2099

In the third example, what is the first factor after subtracting one?

• 783

• 785

• 784

• 786

What is the final product in the third example using the method?

• 784,2155

• 784,2150

• 784,2151

• 784,215