Making Change: Buying a pen

easyGrade 2-4making change

The Problem

David buys a pen that costs $27. David pays with $40. How much change does David receive?

Answer:

$13

Key Information

  • Cost: $27
  • Amount paid: $40

Formula

Change = Amount Paid - Cost

Step-by-Step Solution

1

Identify cost and payment

Cost = $27, Amount paid = $40
2

Set up equation

Change = Amount paid - Cost
3

Substitute values

Change = $40 - $27
4

Calculate

40 - 27 = 13
5

Final answer

David receives $13 in change

Common Mistakes to Avoid

  • Subtracting in wrong order
  • Adding instead of subtracting

Helpful Tips

  • Subtract cost from amount paid
  • Change should be less than what you paid

Real-World Application

Calculating change ensures you receive correct money back when shopping.

Related Topics:

moneysubtractionchangeword problems

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