Estimating Sums and Differences

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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

Transcript of Estimating Sums and Differences

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!!


Estimating Sums and Differences of Whole Numbers.

Estimating Sums and Differences of Whole Numbers.

Today we will be estimating sums and differences with fractions and mixed numbers.

Today we will be estimating sums and differences with fractions and mixed numbers.

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Today we will be estimating sums and differences with fractions and mixed numbers. Our lesson is “All about Measurements!”

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Estimating Sums & Differences

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Estimating Sums and Differences

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