Estimating Sums and Differences

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?
• Dont remember lets listen to the Rounding Rap
• Lets play Eliminator but well 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
Lets Watch Mr. Hardesty!!

• Mr. Hardesty

6
Time for Robo Works!!

• Robo Works!!

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Bales Bucks

• 383 122 hundreds
• 74.50 - 52.74 tens
• 37,215 6,792 thousands
• 20,425 47,236 thousands

• Estimate. Round to the place value shown.
• 312 27 tens
• 1,561 305 hundreds
• 21.75 73.14 tens

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Assignment

• Page 60 - s 9 20
• Get them all correct 2 Bales Bucks!!