ESTIMATION

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# ESTIMATION - PowerPoint PPT Presentation

ESTIMATION. Three Types of Estimation Measurement Estimation Quantity Estimation Computational Estimation If I can drive 326 miles on 15 gallons of gasoline what is my approximate mpg? Is 10 dollars enough to buy 5 drinks that cost \$2.19 each?.

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## PowerPoint Slideshow about 'ESTIMATION' - Gabriel

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Presentation Transcript

### ESTIMATION

Three Types of Estimation

Measurement Estimation

Quantity Estimation

Computational Estimation

If I can drive 326 miles on 15 gallons of gasoline what is my approximate mpg?

Is 10 dollars enough to buy 5 drinks that cost \$2.19 each?

Not a guess, involves some form of reasoning.

Sometimes knowing if the result is more or less than a number is sufficient.

A Computational Estimate

Multi-Digit Numbers

Can be built upon or taken apart in a wide variety of ways.

Use easier-to-handle parts of numbers to create estimates.

Computation can then be done mentally.

Multi-Digit Numbers

Substitute “nice” numbers for hard ones

Computation can then be done mentally.

Computational Estimation

Use a variety of strategies developed over time

Find Real Examples of Estimation

Accept a Range of Estimates

Focus on Flexible Methods NOT Answers

Understanding

Computational Estimation

Use the Language of Estimation

“A little more than”

“A little less than”

“Between””

Understanding

Computational Estimation

Estimating Without Estimates

Over or Under?

37+75 Over or Under 100

712-458 Over or under 300

319/45 Over or under 6

Understanding

Computational Estimation

Estimating Without Estimates

High or Low

736 x 18

750 x 10 730 x 15

700 x 20 750 x 20

Computational Estimation Strategies

Three methods for Computational Estimation

Front End

Rounding

Compatible (nice/friendly) Numbers

In all three--make an initial estimate and then adjust if need be.

Front End Methods

487 + 31 + 710

400+0+700=1100

421/59

400/60=less than 7

Rounding Methods

\$48.17+\$1.89+\$24.95

\$50+\$0+\$20=70

\$4.17 x 6

\$4 x 6 = \$24

Compatible Numbers

41+29+63+17+65+85

300-adjust to a bit more than 300

Compatible Numbers

371/21

400/20=20

Adjust to a few less than 20

69-27

67-27=40

Adjust to a bit more than 40

Estimating with Fractions, Decimals, and Percents

Represent Most Real-World Estimations

Connect to Computational Skill Development