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Estimating Sums and Differences

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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.

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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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