Intro/ Review to Rounding & Estimations

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.

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

Use a complete sentence to answer the following question.

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

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rounded to the nearest 10 is _______.

rounded to the nearest 10 is _______.

rounded to the nearest 10 is _______. 

rounded to the nearest 10 is _______.

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Round to the nearest ten.

Example:  237 → _240_

132 → __________

743 → __________

336 → __________

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Round to the nearest hundred.

Example:  2,432 → _2,400

4,768 → __________

2,423 → __________

8,462 → __________

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Round to the nearest ten.

Example:  2,453 → __2,450__

3,682 → __________

54,637 → __________

41,608 → __________

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Round to the nearest hundred.

Example:  47,286 → __47,300__

25,473 → __________

53,729 → __________

67,821 → __________

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Round to the underlined number.

Example:  472,563 → _473,000_

854,368 → __________

91,483 → __________

748,924 → __________

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Round to the leading digit.

Example:  472,563 → _500,000_

8,328 → __________

683 → __________

748,924 → __________

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Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

17 + 23 → __________  + __________ = __________

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Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

42 + 37 → __________  + __________ = __________

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Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

38 − 14 → __________ − __________ = __________

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Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

9 + 63 → __________  + __________ = __________

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Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

68 − 21 → __________  − __________ = __________

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Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

12 + 82 → __________  + __________ = __________

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Round to the nearest ten.

Example:  263 → _260_

164 → _______           281 → _______           538 → _______ 

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Round to the nearest hundreds.

Example:  6,473 → _6,500_

7,564 → _______           3,281 → _______           5,738 → _______ 

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Round to the underlined digit.

Example:  34,562 → _34,600_

34,269 → _______           729,281 → _______           25,738 → _______ 

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Round to the leading digit.

Example:  49,502 → _50,000_

723,483 → _______           3,281 → _______           26,738 → _______ 

1

Estimate the sum or difference by rounding to the nearest ten.

Example:

28 + 17 → __30__ + __20__ = __50__

46 + 31 → _______+ _______ =  _______

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Estimate the sum or difference by rounding to the nearest hundred.

Example:

278 + 137 → __300__ + __100__ = __400__

486 + 341 → _______+ _______ =  _______

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Estimate the sum or difference by rounding to the nearest hundred.

Example:

278 + 137 → __300__ + __100__ = __400__

5,263 − 2,823 → _______− _______ =  _______

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Estimate the sum or difference by rounding to the leading number.

Example:

278 + 37 → __300__ + __40__ = __260__

24,389 + 4,823 → _______+ _______ =  _______

Intro/ Review to Rounding & Estimations

Use a complete sentence to answer the following question.Which method of estimation do you think is easier, compatible numbers or rounded numbers? Why?

Use a complete sentence to answer the following question.Which method of estimation do you think is easier, compatible numbers or rounded numbers? Why?

Use a complete sentence to answer the following question.

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

Use a complete sentence to answer the following question.

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