Understanding Percentage, Base, and Rate

What is the role of the base in percentage calculations?

• It represents 100% or the total value.

• It represents a part of the percentage.

• It is used to calculate the rate.

• It is always smaller than the percentage.

How is the formula for percentage derived?

• By adding the rate to the base.

• By subtracting the rate from the base.

• By multiplying the rate by the base.

• By dividing the base by the rate.

In a problem, if you know the percentage and the base, what is missing?

• The percentage

• The base

• The rate

• None of the above

What is 30% of 250?

• 50

• 100

• 125

• 75

If 15% of a number is 30, what is the number?

• 200

• 300

• 150

• 250

How do you find the rate if you know the percentage and the base?

• Add the percentage to the base.

• Multiply the percentage by the base.

• Divide the percentage by the base.

• Subtract the base from the percentage.

What is the rate if 20 is 25% of a number?

• 5%

• 10%

• 25%

• 50%

If 10 is 10% of a number, what is the number?

• 200

• 100

• 50

• 80

What is the base if 8 is 10% of it?

• 120

• 100

• 80

• 150

How do you convert a percentage to a decimal?

• Divide by 100

• Multiply by 10

• Divide by 10

• Multiply by 100