Finding Percents Mentally and Using Decimals

This video tutorial teaches how to calculate percentages mentally. It starts with simple examples like finding 10% and 1% of a number by moving the decimal point. The tutorial progresses to more complex calculations such as 20%, 30%, 15%, 35%, 65%, 177%, 23%, and 29% of various numbers. Each example is broken down into steps, demonstrating how to use basic arithmetic operations to find percentages without a calculator. The video emphasizes understanding the relationship between different percentages to simplify mental calculations.

What is 10% of 200?

• 200

• 10

• 2

• 20

How do you calculate 1% of a number?

• Divide by 100

• Move the decimal two places left

• All of the above

• Multiply by 0.01

What is 20% of 250?

• 5

• 250

• 50

• 25

Calculate 30% of 400 using mental math.

• 400

• 30

• 40

• 120

What is 15% of 300?

• 30

• 300

• 45

• 15

Determine 35% of 500 using the method described.

• 175

• 35

• 350

• 50

What does 65% of 600 equal to?

• 65

• 390

• 600

• 300

How much is 177% of 800?

• 800

• 100

• 136

• 177

Find 23% of 900.

• 90

• 207

• 900

• 230

Calculate 29% of 700.

• 70

• 203

• 290

• 700