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Lesson 13.5â Skills Practice
page 7
Name_________________________________________________________ Date__________________________
27. A football is about 280 millimeters long. A football field is about 100,000 millimeters long. How
many footballs placed end to end would be needed to span the field? Use scientific notation to
calculate the number of footballs.
280 5 2.8 3 â10â2â
100,000 5 1 3 â10â5â
â¯ )(10
â¯ )
(2.8
5 â(â¯___
ââ¯ 1â¯â¯ââ¯â¯ââ(â¯10
2.8 )
5
0â5â)â¯
___________
ââ¯ (1 3 â1â¯â¯
ââ¯ 1â¯â¯ââ¯â¯ââ___
ââ¯102â¯ââ¯â¯â
â¯â 5 â___
(2.8 3 â10â2â)
522 )
â¯â
5 â(0.357142â.â.â.â)(10â3â)
5 4 3 â10â2â 5 400
About 400 footballs would span the football field.
Chapter 13â â â Skills Practiceâ â â â¢â â â 911
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