estimating sums and differences of whole numbers

Estimating Sums and Differences of Whole Numbers

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Estimating Sums and Differences of Whole Numbers

You know how to round numbers. Today, you will use rounding to estimate sums and differences.

• What are some things that are often rounded?

Page 3: Estimating Sums and Differences of Whole Numbers

Vera went on a 3 day trip in which she traveled 336 miles on the first

day, 423 on the second day, and 357 miles on the third day. Is 300 or 400 a more reasonable estimate for about

how far she went on each of the 3 days?

Page 4: Estimating Sums and Differences of Whole Numbers

What is each number rounded to the nearest hundred?

Page 5: Estimating Sums and Differences of Whole Numbers

What is the sum of the rounded numbers?

Page 6: Estimating Sums and Differences of Whole Numbers

Estimate 518+271 by rounding to the nearest hundred.

• Then, estimate the sum by rounding to the nearest ten.

• Which estimate is closer to the exact sum?

Page 7: Estimating Sums and Differences of Whole Numbers

Round each number to the nearest hundred:

• 1,250 --

• +204--

• _________

• Then round to the nearest ten! Which estimate is closer!?

Page 8: Estimating Sums and Differences of Whole Numbers

Please work on pages 94-95 # 1-30. You must show your estimated numbers before adding!!!

• Go over work.

• Castle learning/Problem Solving

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