7th Grade Math

(Marvins-Underground-K-12) #1
328 Percent

= Step-by-Step Solutions begin on page R1.
Extra Practice begins on page EP2.

Example 1 Estimate.


  1. 47% of 70 10. 39% of 120 1111 21% of 90

  2. 76% of 180 13. 57% of 29 14. 92% of 104

  3. 24% of 48 16. 28% of 121 17. 88% of 207

  4. 62% of 152 19. 65% of 152 20. 72% of 238


Example 2 21. MONEY Carlie spent $42 at the hair salon. Her mother loaned her the
money. Carlie will pay her mother 15% each week until she has repaid
the loan. About how much will Carlie pay each week?


  1. HEALTH You use 43 muscles to frown. When you smile, you use 32%
    of these same muscles. About how many muscles do you use when
    you smile?


Examples 3 and 4 Estimate.


  1. 132% of 54 24. 224% of 320 25. _ 21 % of 412

  2. _ 43 % of 168 27. 0.4% of 510 28. 0.9% of 74


Example 5 29. GEOGRAPHY The United States has 12,383 miles of coastline. If 0.8% of the
coastline is located in Georgia, about how many miles of coastline are
in Georgia?


  1. BIRDS During migration, 450,000 sandhill cranes stop to rest in Nebraska.
    About 0.6% of these cranes also stop to rest in Oregon. About how many
    sandhill cranes stop in Oregon during migration?


Estimate.


  1. 67% of 8.7 32. 54% of 76.8 33. 32% of 89.9

  2. 10.5% of 238 35. 22.2% of 114 36. 98.5% of 45


3737 ANALYZE GRAPHS Use the graph shown.
a. About how many hours does
Avery spend doing her
homework each day?
b. About how many more hours
does Avery spend sleeping than
doing the activities in the “other”
category? Justify your answer.
c. What is the approximate number
of minutes Avery spends each
day on extracurricular activities?


  1. ANIMALS The average white rhinoceros gives birth to a single calf that
    weighs about 3.8% as much as its mother. If the mother rhinoceros
    weighs 3.75 tons, about how many pounds does its calf weigh?


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Avery’s Day
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