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Estimating Sums and Differences By Mr. Bales

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Estimating Sums and Differences. By Mr. Bales. Objective. By the end of the lesson, you will be able to estimate sum and differences of numbers. Standard 4NS3.1 - Demonstrate an understanding of, and the ability to use, standard algorithms for addition and subtraction of multidigit numbers. - PowerPoint PPT Presentation

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Page 1: Estimating Sums and Differences

Estimating Sums and Differences

By Mr. Bales

Page 2: Estimating Sums and Differences

Objective

By the end of the lesson, you will be able to estimate sum and differences of numbers.

Standard 4NS3.1 - Demonstrate an understanding of, and the ability to use, standard algorithms for addition and subtraction of multidigit numbers.

Page 3: Estimating Sums and Differences

Introduce

Look at this number: 2,362

What is this number rounded to the nearest hundred?

Don’t remember – let’s listen to the Rounding Rap

Let’s play “Eliminator” but we’ll round this time

Page 4: Estimating Sums and Differences

Teach In my left pocket, I have my

entire paycheck - $1.29.

In my right pocket, I have $0.74.

I want to know about how much money I have. What could I do to estimate about how much money I have?

What could $1.29 be rounded to?

What could $0.79 be rounded to?

About how much money is $1.29 + $0.79?

Page 5: Estimating Sums and Differences

Let’s Watch Mr. Hardesty!!

Mr. Hardesty

http://www.mhschool.com/math/2009/ca/assets/asset_view.html?s=PT_G4_CH2_L2
Page 6: Estimating Sums and Differences

Time for Robo Works!!

Robo Works!!

http://www.mhschool.com/math/2009/ca/assets/asset_view.html?s=RW_4_02D
Page 7: Estimating Sums and Differences

Bales Bucks

Estimate. Round to the place value shown.

312 + 27; tens

1,561 + 305; hundreds

$21.75 + $73.14; tens

383 – 122; hundreds

$74.50 - $52.74; tens

37,215 – 6,792; thousands

$20,425 + $47,236; thousands

Page 8: Estimating Sums and Differences

Assignment

Page 60 - #’s 9 – 20

Get them all correct – 2 Bales Bucks!!


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