Estimating With Percents

To estimate 57% of 30 you might...

• Find 55% of 30 
• Find 60% of 30

To find 32% of 89.9 you might...

• Find 32% of 90
• Find 30% of 90

What is 10% of 53?

What is 20% of 53?

Sheri made the list shown of costs she expects this week. To what percent should Sheri round the gratuity for the restaurant server in order to come up with a good estimate?

• 10%

• 15%

• 20%

• 30%

Examine the cost and percents at the restaurant.

Which of the following shows the cost, gratuity percent, and tax percent rounded correctly in order to make a reasonable estimate?

• Cost: $40; Gratuity: 20%; Tax: 0%

• Cost: $40; Gratuity: 20%; Tax: 10%

• Cost: $50; Gratuity: 10%; Tax: 10%

• Cost: $50; Gratuity: 20%; Tax: 10%

To what percent should the tax for the florist be rounded in order to make a reasonable estimate?

• 0

• 5

• 10

• 20

About how much should the gratuity for the restaurant server be?

Round the percent of gratuity to the nearest benchmark percent to find the answer.

About how much will the taxes be on the cost of the meal at the restaurant?

Round the sales tax to the nearest benchmark percent.

Sheri bought flowers for centerpieces for a party. Which estimation strategies could she use to find the gratuity for the florist quickly?

• Round the cost to $90 and percent to 10%.

• Use a benchmark percent of 10%.

• Round the cost to $100 and percent to 20%.

• Use 10% to estimate 12%.