Multiplication Techniques and Properties

This video introduces a multiplication technique that involves doubling one number and halving the other to simplify calculations. The method is demonstrated with examples, showing its efficiency, especially with numbers ending in five. The technique is useful for quick mental calculations, such as those needed in exams like the GRE.

What is the main focus of the video tutorial?

• A division method

• A subtraction shortcut

• A time-saving multiplication technique

• A new addition technique

What mathematical property is the technique based on?

• Addition and subtraction

• Doubling and halving

• Squaring and cubing

• Division and multiplication

What is the result of multiplying 2a and 12b?

• 2a * 12b

• a * 12b

• 2a * b

• a * b

How can you simplify the multiplication of 4 and 18 using the technique?

• Halve both numbers

• Double both numbers

• Double one number and halve the other

• Add both numbers

What is the result of multiplying 8 and 9?

• 90

• 72

• 64

• 81

Why is the technique particularly useful when one number ends in five?

• It makes the number smaller

• It makes calculations more complex

• It turns the number into a nicer number

• It turns the number into a round number

What is the product of 7 and 11 using the technique?

• 81

• 91

• 77

• 88

What is the result of multiplying 3.5 and 22 using the technique?

• 91

• 88

• 81

• 77

How does the technique help with numbers ending in five?

• It makes them odd numbers

• It turns them into even numbers

• It turns them into nicer numbers

• It makes them harder to multiply

What is the result of multiplying 9 by 9?

• 81

• 99

• 90

• 72