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Extensions |
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Sometimes you can use clustering to estimate a sum if all the numbers
are near the same number. To estimate 24 + 26 + 23 + 25, notice that all
the numbers are close to 25. So 4 x 25 or 100 is a good estimate. |
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| Estimate each sum by using clustering. |
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| 23. 29 + 31 + 32 |
24. 49 + 48 + 52 + 51 |
| 25. 23 + 27 + 24 + 27 + 26 |
26. 49 + 51 + 48 + 52 + 51 + 50 |
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| Round each number to the place of the underlined digit. |
| 27. 24.861 |
28. 31,700,386 |
29. 20.433 |
30. 63,395 |
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| 31. Which number has a 4 in the hundredths place? |
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A. 2.483 |
B. 2.834 |
C. 2.843 |
D. 4.832 |
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Structures: Bridges |
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| Opened on May 27, 1937, San Francisco’s Golden Gate Bridge was built for $33,000,000. This suspension bridge is 1.7 miles long, with an average daily traffic of 125,000 vehicles. |
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Use
rounding to estimate the difference between
the length of the Golden Gate Bridge and
Brooklyn Bridge, which is 0.66 mile long. |
| 2. |
About how many vehicles cross the Golden Gate Bridge in 2 days? In 4 days? In 8 days? |
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All
text pages available online and on CD-ROM. |
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