 A cash register contains money in bills $1's, $5's, $10' and $20's. Explain the problem and make a plan to figure out the total amount of money in the drawer.

To figure out the total amount of money in the cash register, we need to account for the different types of bills ($1, $5, $10, and $20) and how many of each are present. Here’s how to approach the problem:

### Problem Breakdown:
1. **Different Denominations**: There are four types of bills—$1, $5, $10, and $20.
2. **Quantity of Each Bill**: You’ll need to know how many of each type of bill is in the register.
3. **Summing Total**: Multiply the number of each type of bill by its respective value, then sum the totals.

### Plan:
1. **Step 1: Count the number of each bill**.
   - Find how many $1 bills, $5 bills, $10 bills, and $20 bills are in the cash register.

2. **Step 2: Multiply the number of each bill by its value**.
   - Multiply the number of $1 bills by 1.
   - Multiply the number of $5 bills by 5.
   - Multiply the number of $10 bills by 10.
   - Multiply the number of $20 bills by 20.

3. **Step 3: Add the results together**.
   - Add the amounts from each denomination to get the total amount of money in the cash register.

### Example:
- Suppose the cash register contains:
  - 15 one-dollar bills,
  - 7 five-dollar bills,
  - 3 ten-dollar bills,
  - 2 twenty-dollar bills.

Now, applying the plan:
- $1 bills: $ 15 \times 1 = 15 $
- $5 bills: $ 7 \times 5 = 35 $
- $10 bills: $ 3 \times 10 = 30 $
- $20 bills: $ 2 \times 20 = 40 $

**Total**: $ 15 + 35 + 30 + 40 = 120 $

So, the total amount of money in the register is $120.

Would you like more details, or have any specific questions on this method?

Here are 5 related questions to expand this problem:
1. How would the method change if you included coins as well?
2. Can you calculate the total if the cash register also contains $50 bills?
3. How would you express the total amount as an algebraic equation?
4. How could you estimate the total if only approximate quantities of each bill were known?
5. How would you verify your total to ensure accuracy?

**Tip**: When solving problems involving multiple items, it's helpful to organize your data in a table or chart to make calculations more systematic.

A cash register contains money in bills $1's, $5's, $10' and $20's. Explain the problem and make a plan to figure out the total amount of money in the drawer.

Learn how to calculate the total amount of money in a cash register by multiplying the number of $1, $5, $10, and $20 bills by their values and adding the results. This guide includes an example with step-by-step calculations, perfect for students in Grades 3-5.

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