Round 2-Digit and 3-Digit Numbers CA Standards NS 1.4 Round off numbers to 10,000 to the nearest ten, hundred, and thousand. Objective Round 2-digit and 3-digit numbers to the nearest ten or hundred. NS 1.0 Students understand the place value of whole numbers. Also KEY NS 1.3 , MR 1.1, MR 2.3, MR 2.4, MR 2.5 round You can use what you know about place value to round numbers and estimate quantities. A theater company performed 154 shows. Give an estimate of the number of shows by rounding to the nearest hundred. estimate Different Ways to Round Way 1 Use rounding rules. 1 Underline the digit in the place you are rounding to. hundreds place 2 Circle the digit to the right of the underlined digit. circled digit 3 If the circled digit is 5 or greater, increase the underlined digit by 1. If the circled digit is less than 5, leave the underlined digit unchanged. Then replace the digits to the right of the underlined digits with zeros. Houghton Mifflin California Math, Lesson Transparency 2.3 Copyright © Houghton Mifflin Company. All rights reserved. Use with Chapter 2, Lesson 3 154 rounds to 200. Way 2 Use a number line. 2OUNDSTO ISHALFWAY Find 154 on the number line. 154 is closer to 200 than to 100. So, 154 rounds to 200. Solution: The theater company performed about 200 shows. Another Example Round 263 to the nearest ten. 26 3 2OUNDSTO 260. 3 is less than 5. So, 263 rounds to 260. Round the number to the nearest ten and the nearest hundred. 1. 466 2. 765 3. 45 To what place am I rounding? 4. 71 Guided Problem Solving Use the questions to solve this problem. 5. The show is about to start. There are 273 people to be seated. Estimate to the nearest ten the number of people waiting. a. Understand What are you asked to find? b. Plan Choose a way to solve the problem. c. Solve Round and show your work. d. Look Back Solve the problem another way. Did you get the same answer? Math Talk Will says that 395 rounded to the nearest ten is the same as 395 rounded to the nearest hundred. Is he right or wrong? Explain your answer. Houghton Mifflin California Math, Lesson Transparency 2.3 Copyright © Houghton Mifflin Company. All rights reserved. Use with Chapter 2, Lesson 3

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