Estimations - NICHOLAS GLAESER | Library

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rounded to the nearest 10 is __________.          91 rounded to the nearest 10 is __________.

rounded to the nearest 10 is __________.          25 rounded to the nearest 10 is __________.

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rounded to the nearest 10 is __________.          35 rounded to the nearest 10 is __________.

rounded to the nearest 10 is __________.          64 rounded to the nearest 10 is __________.

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rounded to the nearest 100 is __________.          563 rounded to the nearest 100 is __________.

rounded to the nearest 100 is __________.          419 rounded to the nearest 100 is __________.

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rounded to the nearest 100 is __________.          850 rounded to the nearest 100 is __________.

rounded to the nearest 100 is __________.          651 rounded to the nearest 100 is __________.

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Compatible numbers are the numbers that are easy to add, subtract, multiply, or divide mentally (in your head).

Rounded numbers are an integer that ends with one or more "0"s.

Which box below represents compatible numbers and which box below represents rounded numbers?

Which method of estimation do you think is easier, compatible numbers or rounded numbers? Why?

Sentence Stem (type in a complete sentense):
I think the easier method of estimation is to use because _____________________.

Vocabulary
compatible numbers approximate round
rounded numbers estimate add/ subtract

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Your turn!  Round the numbers to estimate the answers.

73 + 57 -->  __________ + __________ = __________

84 − 59 --> __________ - __________ = __________

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Round the numbers to estimate the answers.

415 + 376 -->  __________ + __________ = __________

825 − 387 --> __________ - __________ = __________

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Sarah read 268 pages last month.  Demetri read 511 pages.  How would we write an equation that shows the best estimate for the total number of pages Sarah and Demetri read?

__________ __________ __________ = __________

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When Tina awoke, the outside temperature was 68°F.  The temperature that afternoon was 93°F.  Write an equation Tina could use to estimate the difference between the morning temperature and the afternoon temperature.

__________ __________ __________ = __________

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The chart shows the number of each type of sports ball Coach Paul has in the equipment room.

Write an equation that shows the best estimate for the total number of sports balls Coach Paul has in the equipment room.

__________ + 30 + __________ + __________ = __________

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Marty has two ant farms. One ant farm has 327 red ants and the other ant farm has 512 black ants. To find his estimated total, Marty wrote 300 + 500. Which best describes the method of estimation used by Marty.
Terrell has 64 movie DVDs and 37 sports DVDs. To find the approximate difference in the two numbers, he wrote 65 − 35. Which best describes the method of estimation used by Terrell.
Lilly has 37 sun dresses and 23 formal dresses. To find about how many dresses she has all together, she wrote 40 + 20. Which best describes the method of estimation used by Lilly.

Rounding to nearest 10
Rounding to nearest 100
Using compatible numbers

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The table shows how many people visited Splashy Water Park for 3 days and nights.

What is the best estimate of the total number of people who visited the park on Monday and Wednesday?

Monday: __________ + __________ = __________

Wednesday: __________ + __________ = __________

The best estimate of the total number of people who visited the park on Monday and Wednesday is __________.

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Estimate to the nearest 10.

43 + 47 = _______

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Estimate to the nearest 100.

537 − 298 = _______

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Estimate to the nearest 10.

94 − 28 = _______

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Estimate to the nearest 100.

743 + 598 = _______

Make sure you add a comma in the correct place.

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Millie sold 27 boxes of Thin Mints girl scout cookies and 42 boxes of Peanut Butter Patties. About how many more boxes of Peanut Butter Patties did Millie sell than Thin Mints?

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Nate's father asks him to research the cost of a new laptop computer and printer. He finds a new laptop for $455 and a printer for $142. What amount should Nate tell his father if he rounds both prices to the nearest $10?