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Estimating Sums and Differences

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.

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Estimating Sums and Differences

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  1. Estimating Sums and Differences By Mr. Bales

  2. 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.

  3. 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

  4. 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?

  5. Let’s Watch Mr. Hardesty!! Mr. Hardesty

  6. Time for Robo Works!! Robo Works!!

  7. 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

  8. Assignment Page 60 - #’s 9 – 20 Get them all correct – 2 Bales Bucks!!

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