By I. Bello

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Thus, 405,648 rounded to the nearest hundred is 405,600. b. Step 1. 405,648 Underline the 5 (the thousands place). Step 2. 406,648 Six is more than 5 (add 1 to the 5). Step 3. 5ϩ1ϭ6 406, 000 ︸ Change to zeros. Thus, 405,648 rounded to the nearest thousand is 406,000. c. Step 1. 405,648 Underline the zero (the ten thousands place). Step 2. 415,648 Five is equal to 5 (add 1 to the 0). Step 3. 0ϩ1ϭ1 410,000 ︸ Change to zeros. Thus, 405,648 rounded to the nearest ten thousand is 410,000. Rounding whole numbers In 2009, the best-selling car in America was the Toyota Camry.

Hart FLP, and Creators Syndicate, Inc. indd 2 A V Place Value The position of each digit in a number determines the digit’s place value. Look at the world population clock. Which is the only digit that is missing? Which digits are repeated? What is the value of the digits that are repeated? It depends! To help you with the answer, we use a place value chart in which each group of three digits is called a period. 1 Standard Numerals 3 H un dr Te ed t n tr rilli Tr illio ons ill n io s ns H un dr Te ed b n bi illi Bi llio ons lli ns on H s un d Te red n m mil M illio lion ill io ns s ns H un d Te red t n th ho Th ous usan ou an ds sa ds nd H s un dr Te eds ns O ne s quintillions, and so on.

8 0 0 We then have 813 Ϸ 800. Thus, 813 rounded to the nearest hundred is 800. ) PROBLEM 4 EXAMPLE 4 Rounding whole numbers Round 3500 to the nearest thousand. Round 6508 to the nearest thousand. SOLUTION 4 Step 1. Underline the place to which we are rounding. 3500 * Some textbooks round a number ending in 5 so that the last retained digit is even. Answers to PROBLEMS 3. 347 Ϸ 300 4. 2 Step 2. The first digit to the right of the underlined digit is 5, so we add one to the underlined digit (obtaining 4).