# Math Models and Geometry

## Solve Money Applications


### Solve Coin Word Problems

Imagine taking a handful of coins from your pocket or purse and placing them on your desk. How would you determine the value of that pile of coins?
If you can form a step-by-step plan for finding the total value of the coins, it will help you as you begin solving coin word problems.
One way to bring some order to the mess of coins would be to separate the coins into stacks according to their value. Quarters would go with quarters, dimes with dimes, nickels with nickels, and so on. To get the total value of all the coins, you would add the total value of each pile.
How would you determine the value of each pile? Think about the dime pile—how much is it worth? If you count the number of dimes, you'll know how many you have—the number of dimes.
But this does not tell you the value of all the dimes. Say you counted  dimes, how much are they worth? Each dime is worth —that is the value of one dime. To find the total value of the pile of  dimes, multiply  by  to get  This is the total value of all  dimes.
You could continue this process for each type of coin, and then you would know the total value of each type of coin. To get the total value of all the coins, add the total value of each type of coin.
Let's look at a specific case. Suppose there are  quarters,  dimes,  nickels, and  pennies. We'll make a table to organize the information – the type of coin, the number of each, and the value.
The total value of all the coins is  Notice how  helped us organize all the information. Let's see how this method is used to solve a coin word problem.

### Solve Ticket and Stamp Word Problems

The strategies we used for coin problems can be easily applied to some other kinds of problems too. Problems involving tickets or stamps are very similar to coin problems, for example. Like coins, tickets and stamps have different values; so we can organize the information in tables much like we did for coin problems.
Now we'll do one where we fill in the table all at once.

### Key Concepts

1. Finding the Total Value for Coins of the Same Type

2. Solve a Coin Word Problem
3. 

### Practice Makes Perfect

Solve Coin Word Problems 
In the following exercises, solve the coin word problems.
Solve Ticket and Stamp Word Problems 
In the following exercises, solve the ticket and stamp word problems.

### Everyday Math


### Writing Exercises


### Self Check

ⓐ After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.


ⓑ After reviewing this checklist, what will you do to become confident for all objectives?
