Subtracting dollars and cents helps you:
- Keep track of how much you spend.
- Know how much you have left after a purchase.
- Budget your funds wisely.
Let’s look at some examples to understand how subtraction works with currency.
Example 1: Small Purchase
Problem: You have $25. You spend $7 on snacks. How much do you have in total left?
Calculation: $25 (starting amount) − $7 (spent) = $18. You have $18 left.
Answer: You have $18.00 left.
Example 2: Buying a Toy
Problem: You have $50. You buy a toy for $23. How much is left?
Calculation: $50 − $23 = $27. You have $27 left.
Calculation: 50–50–23 = $27
Answer: You have $27.00 left.
Example 3: Larger Purchase
Problem: You have $100. You spend $47 on clothes. How much do you have left?
Calculation: $100 − $47 = $53. You have $53 left.
Calculation: 100–100–47 = $53
Answer: You have $53.00 left.
Mixed Addition and Subtraction with Currency
Learning to combine addition and subtraction helps you:
- Track your funds when you earn and spend.
- Budget effectively by knowing how much you have at any time.
- Make smart spending decisions.
Let’s break down an example step by step.
Example Problem
Scenario:
- You start with $10.
- You find $5 on the ground.
- You buy a book for $8. Question: How much do you have in total now?
Step-by-Step Calculation
- Add the currency you found to your original amount.
- You had: $10
- You found: +$5
- Calculation: 10+10+5 = $15
- Subtract the cost of the book.
- Now you have: $15
- You spend: –$8
- Calculation: 15–15–8 = $7
Final Answer: You now have $7.00 left.