Mental Math Techniques for GRE

This video introduces four mental math techniques to help students tackle the GRE quantitative reasoning section more efficiently. The techniques include dividing by five using a two-step process, using doubling and halving for multiplication, squaring numbers ending in five, and using percentage shortcuts. These methods aim to simplify complex calculations, reduce reliance on calculators, and build math confidence.

What is the main purpose of learning mental math techniques for the GRE?

• To avoid using the GRE calculator

• To improve speed and confidence in solving math problems

• To memorize math formulas

• To make math problems more complex

What is the first step in the trick for dividing a number by 5?

• Divide the number by 2

• Multiply the number by 5

• Double the number

• Subtract 5 from the number

After doubling the number in the division by 5 trick, what is the next step?

• Multiply the result by 5

• Subtract 10 from the result

• Add 10 to the result

• Divide the result by 10

What is the result of dividing 235 by 5 using the mental math trick?

• 23.5

• 407

• 47

• 2350

What is the first step in the trick for dividing a number by 5?

• Divide the number by 2

• Multiply the number by 5

• Double the number

• Subtract 5 from the number

After doubling the number in the division by 5 trick, what is the next step?

• Add 10 to the result

• Subtract 10 from the result

• Divide the result by 10

• Multiply the result by 5

What is the result of dividing 235 by 5 using the mental math trick?

• 47

• 2350

• 407

• 23.5

In the doubling and halving trick, what do you do to one of the numbers?

• Double both numbers

• Halve both numbers

• Double one number and halve the other

• Add both numbers

Why is the doubling and halving trick effective?

• It makes the numbers larger

• It only works for even numbers

• It changes the overall product

• It simplifies the calculation

What is the result of multiplying 14 by 25 using the doubling and halving trick?

• 350

• 325

• 300

• 375