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Round Whole Numbers and Decimals, Lesson Menu

This interactive lesson menu covers rounding whole numbers and decimals. It provides examples for rounding whole numbers to the nearest thousand and rounding decimals to the nearest tenth. The lesson also includes a check for reasonableness and a five-minute check at the end.

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Round Whole Numbers and Decimals, Lesson Menu

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Presentation Transcript

  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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