1.7 Rounding Whole Numbers

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Presentation transcript:

1.7 Rounding Whole Numbers Objectives 1. Locate the place to which a number is to be rounded. 2. Round numbers. 3. Round numbers to estimate an answer. 4. Use front end rounding to estimate an answer. Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 2 Using Rounding Rules for 4 or Less Round 643 to the nearest hundred. Round 27,621 to the nearest thousand. Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 3 Using Rounding Rules a. Round 2271 to the nearest ten. b. Round 14,972 to the nearest hundred. Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 5 Rounding Large Numbers Round 48,751 to the nearest ten-thousand. Round 736 to the (a) nearest ten and (b) the nearest hundred. nearest ten b. nearest hundred Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 6 Using Rounding to Estimate an Answer Estimate each answer by rounding to the nearest ten. a. 28 41 91 + 46 Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 7 Using Rounding to Estimate an Answer Estimate each answer by rounding to the nearest ten. b. 65 38 – Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 8 Using Rounding to Estimate an Answer Estimate each answer by rounding to the nearest ten. c. 72 46 x Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 9 Using Rounding to Estimate an Answer Estimate each answer by rounding to the nearest hundred. a. 723 285 197 + 644 Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 9 Using Rounding to Estimate an Answer Estimate each answer by rounding to the nearest hundred. b. 832 – 274 Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. A convenient way to estimate an answer is to use front end rounding. With front end rounding, we round to the highest possible place so that all digits become 0 except for the first one. Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 10 Using Front End Rounding to Estimate an Answer Estimate each answer using front end rounding. a. 38 1624 4178 + 339 Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 10 Using Front End Rounding to Estimate an Answer Estimate each answer using front end rounding. b. 5162 – 875 Copyright © 2010 Pearson Education, Inc. All rights reserved.

Copyright © 2010 Pearson Education, Inc. All rights reserved. Parallel Example 10 Using Front End Rounding to Estimate an Answer Estimate each answer using front end rounding. c. 8250 x 36 Copyright © 2010 Pearson Education, Inc. All rights reserved.