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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```  _  __   __   __   __   __   _    _     ____
| |/ //  \ \\/ //  \ \\/ // | || | ||  |  _ \\
| ' //    \ ` //    \   //  | || | ||  | |_| ||
| . \\     | ||     / . \\  | \\_/ ||  | .  //
|_|\_\\    |_||    /_//\_\\  \____//   |_|\_\\
`-` --`    `-`'    `-`  --`   `---`    `-` --`

```
Cody (moderator)7 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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Ron Larson (author)7 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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```  _  __   _    _     ____      ______
| |/ // | || | ||  |  _ \\   /_   _//   ____
| ' //  | || | ||  | |_| ||   -| ||-   |    \\
| . \\  | \\_/ ||  | .  //    _| ||_   | [] ||
|_|\_\\  \____//   |_|\_\\   /_____//  |  __//
`-` --`   `---`    `-` --`   `-----`   |_|`-`
`-`
```
• 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.)

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

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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.)

• 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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``` _    _      ___                ______   ______
| |  | ||   / _ \\      ___    /_   _// |      \\
| |/\| ||  / //\ \\    /   ||   -| ||-  |  --  //
|  /\  || |  ___  ||  | [] ||   _| ||_  |  --  \\
|_// \_|| |_||  |_||   \__ ||  /_____// |______//
`-`   `-` `-`   `-`     -|_||  `-----`  `------`
`-`
```
• 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.)

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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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``` _    _    _    _    ______      ___      _  _
| || | || | || | || |      \\   / _ \\   | \| ||
| || | || | || | || |  --  //  | / \ ||  |  ' ||
| \\_/ || | \\_/ || |  --  \\  | \_/ ||  | .  ||
\____//   \____//  |______//   \___//   |_|\_||
`---`     `---`   `------`    `---`    `-` -`

```
• 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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``` _    _     _____               _____     _  __