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1.3 Using Percent

1.3 Using Percent
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  • 9. Bones in a Human Hand

    Of the hand bones, 28 are finger bones (14 phalanges in each hand). What percent of the hand bones are finger bones? (See Example 3 and Example 4.)

    • Worked-Out Solution

      To find the percent of hand bones that are finger bones, divide the number of finger bones by the total number of bones in the hands.

      Of the bones in the hands, about 73.7% are finger bones.

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     ______    _    _     _____    __   __    _  _   
    |      \\ | || | ||  |__  //   \ \\/ //  | \| || 
    |  --  // | || | ||    / //     \ ` //   |  ' || 
    |  --  \\ | \\_/ ||   / //__     | ||    | .  || 
    |______//  \____//   /_____||    |_||    |_|\_|| 
    `------`    `---`    `-----`     `-`'    `-` -`  
                                                     
    
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    Cody (moderator)6 years ago |
    Some sources consider the ankle and wrist bones to be a part of the feet and hand bones. If you were to consider the ankle and wrist bones as part of the feet and hand bones then the total number of bones in the feet would be 52,and the total number of bones in the hands would be 54.
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    system user
    Ron Larson (author)6 years ago |
    When I was solving this exercise, I thought it was interesting that there are the same number of bones in a human hand as there are in a human foot.
    0
  • 10. Bones in a Human Head

    Of the head bones, 14 are facial bones. What percent of the head bones are facial bones? (See Example 3 and Example 4.)

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      ______     ___     _____      _____             
     /_   _//   / _ \\  |  __ \\   |  ___||   ____    
     `-| |,-   / //\ \\ | |  \ ||  | ||__    |    \\  
       | ||   |  ___  ||| |__/ ||  | ||__    | [] ||  
       |_||   |_||  |_|||_____//   |_____||  |  __//  
       `-`'   `-`   `-`  -----`    `-----`   |_|`-`   
                                             `-`      
    
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  • 11. Bones in a Human's Hips and Legs

    What percent of the bones in the human body are in the hips and legs?
    (See Example 3 and Example 4.)

    data folder

    • Worked-Out Solution

      To find the percent of bones in the human body that are in the hips and legs, divide the number of bones in the hips and legs by the total number of bones in the body.

      Of the bones in the body, about 4.9% are in the hips and legs. Although these bones make up only about 5% of the bones in the body, they are large and account for a major percent of your bone marrow.

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      ______    _____     _  __    _____   __    __  
     /_   _//  |  ___||  | |/ //  |  ___|| \ \\ / // 
     `-| |,-   | ||__    | ' //   | ||__    \ \/ //  
       | ||    | ||__    | . \\   | ||__     \  //   
       |_||    |_____||  |_|\_\\  |_____||    \//    
       `-`'    `-----`   `-` --`  `-----`      `     
                                                     
    
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  • 12. Bones in a Human's Trunk

    What percent of the bones in the human body are in the trunk? (See Example 3 and Example 4.)

    data folder

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                 ___    __    __    ______    ______  
        ___     / _ \\  \ \\ / //  /_   _//  /_____// 
       /   ||  | / \ ||  \ \/ //    -| ||-   `____ `  
      | [] ||  | \_/ ||   \  //     _| ||_   /___//   
       \__ ||   \___//     \//     /_____//  `__ `    
        -|_||   `---`       `      `-----`   /_//     
         `-`                                 `-`      
    
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  • 13. Bones in a Human's Hands, Wrists, Feet, and Ankles

    The skeletal system is a complex work of nature with the hands and feet being the most intricate. What percent of the bones are in the hands, wrists, feet, and ankles? (See Example 3 and Example 4.)

    data folder

    • Worked-Out Solution

      Begin by adding the bones in the hands, wrists, feet, and ankles.

      To find the percent that these bones make up of the total, divide 106 by the total number of bones in the human body.

      Of the bones in the body, about 51.5%, or roughly half, are in the hands, wrists, feet, and ankles.

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      ____     _    _    _    _     ______    _  _   
     |  _ \\  | || | || | || | ||  /_   _//  | \| || 
     | |_| || | || | || | || | ||   -| ||-   |  ' || 
     | .  //  | \\_/ || | \\_/ ||   _| ||_   | .  || 
     |_|\_\\   \____//   \____//   /_____//  |_|\_|| 
     `-` --`    `---`     `---`    `-----`   `-` -`  
                                                     
    
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  • 14. Comparing Lengths of Human Bones

    The longest bone in the body is the thigh bone (femur). The average adult male has a femur that is 48 centimeters long. Use estimation and percent to compare the length of the stapes to the length of the femur in an average adult male. (See Example 3 and Example 4.)

    data folder

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     _    _      ___     ______     _____     _  __  
    | |  | ||   / _ \\  |      \\  |  ___||  | |/ // 
    | |/\| ||  | / \ || |  --  //  | ||__    | ' //  
    |  /\  ||  | \_/ || |  --  \\  | ||__    | . \\  
    |_// \_||   \___//  |______//  |_____||  |_|\_\\ 
    `-`   `-`   `---`   `------`   `-----`   `-` --` 
                                                     
    
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  • 15. Weight of a Human Skeleton

    The skeleton of a 160-pound man weighs about 30 pounds. What percent of the man's weight is his skeleton? (See Example 3 and Example 4.)

    • Worked-Out Solution

      To find the percent of the man's total weight that is his skeleton, divide the skeleton's weight by his total weight.

      The man's skeleton makes up about about 20% of his total weight.

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     _____      _____     ____      ______   _    _   
    |  __ \\   |  ___||  |  _ \\   /_   _// | |  | || 
    | |  \ ||  | ||__    | |_| ||   -| ||-  | |/\| || 
    | |__/ ||  | ||__    | .  //    _| ||_  |  /\  || 
    |_____//   |_____||  |_|\_\\   /_____// |_// \_|| 
     -----`    `-----`   `-` --`   `-----`  `-`   `-` 
                                                      
    
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  • 16. Weight of a Human Skeleton

    The man in Exercise 15 gains 30 pounds. What percent of the man's new weight is his skeleton? (See Example 3 and Example 4.)

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      ______     ___                 ___       _____  
     /_   _//   / _ \\    ____      / _ \\    / ___// 
       | ||    | / \ ||  |    \\   | / \ ||   \___ \\ 
      _| ||    | \_/ ||  | [] ||   | \_/ ||   /    // 
     /__//      \___//   |  __//    \___//   /____//  
     `--`       `---`    |_|`-`     `---`   `-----`   
                         `-`                          
    
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