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How do you round 9’s within a number?

In this lesson, you will learn how to effectively round numbers containing 9's using base ten blocks and place value concepts. We will explore rounding to the nearest ten, hundred, and thousand through practical examples and exercises. Understand key terms like benchmark numbers and round numbers like 196, 3,950, and 45,897. Engage in a number hunt for 9's in real-world contexts, and record your findings. Develop a solid grasp of rounding principles while building confidence in manipulating large numbers.

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How do you round 9’s within a number?

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  1. How do you round 9’s within a number? For example: 67,982 becomes 68,000 Huh?

  2. In this lesson you will learn how to round 9’s by using base ten blocks and place value concepts.

  3. Ones Thousands Hundreds Tens x 10 x 10 x 10

  4. Midpoint 700 750 800 Benchmark Numbers l l l l l l l l l l l 783

  5. 5500 5000 6000 5500 - 5999 5001 - 5499 5500 5000 6000 l l l l l l l l l l l

  6. Misapplying the concept of “rounding 9’s”. For example: 4,396 = 4,300 4,396= 4,400

  7. Now I have 20 groups of 10. Round 196 to the nearest ten. 20 groups of 10 = 200

  8. 190 200 Benchmark Numbers l l l l l l l l l l l 196

  9. Now I have another group of 100. 10 20 40 30 Round 3,950 to the nearest 100. 40 groups of 100 = 4,000

  10. 3,900 4,000 Benchmark Numbers l l l l l l l l l l l 3,950

  11. Round 45,892 to the nearest 10. 45,890 Rounding down was easy. Round 45,897 to the nearest 10. Rounding up requires that I move to the next place value.

  12. Round 45,897 to the nearest 10. 45,890 45,900 Benchmark Numbers 45,897 rounds up to 45,900.

  13. In this lesson you have learned how to round 9’s by using base ten blocks and place value concepts.

  14. Round 289,793 to the nearest thousand.

  15. Go on a big number hunt. Search newspapers, magazines, or the internet. Can you find a number that contains “9” as a digit? • What place in the number is the “9”? • Round your number to that place. Record your results in your math journal.

  16. Use base ten blocks to build 2,999. Round that number to the nearest 10. In your math journal, record your new number. Draw and explain the process of rounding 2,999 to the nearest 10.

  17. Round 356,972 to the nearest hundred.

  18. Round 899,703 to the nearest ten thousand.

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