Multiplication Techniques and Tricks

The video tutorial on the Tech Math Channel introduces a series of fast multiplication tricks. It begins with methods for multiplying by 11, followed by techniques for multiplying numbers in the teens. The tutorial then covers strategies for multiplying two-digit and three-digit numbers, including a specific trick for numbers where the units add up to 10. The video concludes with a preview of future content on squaring and percentages.

What is the first step in multiplying a number by 11?

• Multiply the number by 10.

• Subtract 1 from the number.

• Write down the first digit.

• Add all the digits together.

When multiplying 11 by 134, what is the second digit of the result?

• 4

• 3

• 7

• 1

In the multiplication of 11 by 2471, what is the final result?

• 27481

• 27181

• 271181

• 274181

What is the first step in multiplying two teen numbers?

• Multiply the tens digits.

• Multiply the units digits.

• Subtract the smaller number from the larger number.

• Add the units digit of one number to the other number.

What is the result of multiplying 13 by 12 using the teen number trick?

• 156

• 152

• 162

• 172

When multiplying 15 by 19, what is the units digit of the result?

• 9

• 4

• 5

• 8

What is the first step in multiplying larger two-digit numbers?

• Subtract the units digits.

• Add the tens digits.

• Multiply the units digits.

• Multiply the tens digits.

What is the result of multiplying 23 by 12 using the larger two-digit trick?

• 286

• 276

• 296

• 306

In the multiplication of 14 by 23, what is the tens digit of the result?

• 3

• 4

• 2

• 1

What is the first step in multiplying three-digit numbers directly?

• Multiply the units digits.

• Add the hundreds digits.

• Multiply the tens digits.

• Multiply the hundreds digits.