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How do you round 9’s within a number?

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How do you round 9’s within a number?. For example: 67, 9 82 becomes 68,000. Huh?. In this lesson you will learn how to round 9’s by using base ten blocks and place value concepts. Ones. Thousands. Hundreds. Tens. x 10. x 10. x 10. Midpoint. 700. 750. 8 00.

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Presentation Transcript
slide1
How do you round 9’s within a number?

For example:

67,982 becomes 68,000

Huh?

slide2

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

slide3

Ones

Thousands

Hundreds

Tens

x 10

x 10

x 10

slide4

Midpoint

700

750

800

Benchmark Numbers

l l l l l l l l l l l

783

slide5

5500

5000

6000

5500 - 5999

5001 - 5499

5500

5000

6000

l l l l l l l l l l l

slide6

Misapplying the concept of “rounding 9’s”.

For example:

4,396 = 4,300

4,396= 4,400

slide7

Now I have 20 groups of 10.

Round 196 to the nearest ten.

20 groups of 10 = 200

slide8

190

200

Benchmark Numbers

l l l l l l l l l l l

196

slide9

Now I have another group of 100.

10

20

40

30

Round 3,950 to the nearest 100.

40 groups of 100 = 4,000

slide10

3,900

4,000

Benchmark Numbers

l l l l l l l l l l l

3,950

slide11

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.

slide12

Round 45,897 to the nearest 10.

45,890

45,900

Benchmark Numbers

45,897 rounds up to 45,900.

slide13

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

slide15

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.
slide16

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.

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