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Round Whole Numbers and Decimals, Lesson Menu

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  1. Splash Screen

  2. Five-Minute Check (over Lesson 1–8) Main Idea and Vocabulary Example 1: Round Whole Numbers Example 2: Round Decimals Lesson Menu

  3. I will round whole numbers and decimals. • round Main Idea/Vocabulary

  4. 8,157 Round Whole Numbers Omar traveled 8,157 miles last summer with his family. Round 8,157 to the nearest thousand. Step 1 Underline the digit in the place to be rounded. In this case, the 8 in the thousands place is to be rounded. 8,157 Step 2 Look at 1, the digit to the right of the underlined digit. Example 1

  5. 8,157 Round Whole Numbers Step 3 If this digit is 4 or less, do not change the underlined digit. Since 1 < 5, keep the digit 8 the same. Step 4 Replace all digits after the underlined digit with zeros. 8,000 Answer:To the nearest thousand, 8,157 rounds to 8,000. Example 1

  6. Round Whole Numbers Check for Reasonableness On the number line, 8,157 is closer to 8,000 than to 9,000. So, the answer is reasonable. Example 1

  7. A B C D Round 24,763 to the nearest thousand. • 20,000 • 24,000 • 25,000 • 30,000 Example 1

  8. 910.356 Round Decimals Round 910.356 to the nearest tenth. Step 1 Underline the digit in the tenths place, 3. 910.356 Step 2 Look at 5, the digit to the right of 3. Example 2

  9. 910.356 Round Decimals Step 3 If this digit is 5 or greater, add 1 to the underlined digit. Since 5 = 5, add 1 to the 3. 910.4 Step 4 Drop the digits after the underlined digit. Answer:So, 910.356 rounds to 910.4. Example 2

  10. Round Decimals Check for Reasonableness On the number line, 910.356 is closer to 910.4 than to 910.3. So, the answer is reasonable. Example 2

  11. A B C D Round 47.324 to the nearest tenth. • 47 • 47.3 • 47.4 • 48 Example 2

  12. End of the Lesson End Lesson

  13. Five-Minute Check (over Lesson 1–8) Image Bank Math Tool Chest Add and Subtract Decimals Resources

  14. A B C D (over Lesson 1–8) Use the guess and check strategy to solve. Willie has 11 coins in his pocket. More than half are quarters, only one coin is a dime, and he has the same number of nickels as pennies. He has less than $2.00. How much money does Willie have? • $1.72 (6 quarters, 1 dime, 2 nickels, and 2 pennies) • $1.48 (5 quarters, 1 dime, 2 nickels, 3 pennies) • $2.16 (8 quarters, 1 dime, 1 nickel, 1 penny) • $1.78 (6 quarters, 1 dime, 3 nickels, 3 pennies) Five Minute Check 1

  15. End of Custom Shows

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