Decimal Addition with Money: Calculate $4.3 + $5.1 in Shopping Context

Decimal Addition with Real-World Applications

Jazmin spends 4.3 4.3 dollars on cucumbers and 5.1 5.1 dollars on tomatoes.

How much does she spend in total?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We will use long addition for calculation
00:09 We will place the decimal point in the appropriate place
00:12 Each time we'll add, calculate and place accordingly
00:21 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Jazmin spends 4.3 4.3 dollars on cucumbers and 5.1 5.1 dollars on tomatoes.

How much does she spend in total?

2

Step-by-step solution

To work out how much Jazmin pays in total, we must add the cost of cucumbers and the cost of tomatoes together:

4.3+5.1 4.3\\+5.1

This gives us the answer:

9.4 9.4

3

Final Answer

9.4 9.4

Key Points to Remember

Essential concepts to master this topic
  • Alignment: Line up decimal points vertically when adding
  • Technique: Add column by column: 4.3 + 5.1 = 9.4
  • Check: Verify by estimation: 4 + 5 = 9, so 9.4 is reasonable ✓

Common Mistakes

Avoid these frequent errors
  • Misaligning decimal points during addition
    Don't line up numbers by their right edge like whole numbers = wrong decimal placement! This shifts place values and gives incorrect totals. Always align decimal points directly above and below each other before adding.

Practice Quiz

Test your knowledge with interactive questions

Which decimal number is greater?

FAQ

Everything you need to know about this question

Why can't I just add the numbers like regular addition?

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You can use regular addition rules, but you must align the decimal points first. This ensures each digit is in the correct place value column (tenths with tenths, ones with ones, etc.).

What if the decimal numbers have different amounts of digits after the decimal?

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Add zeros to make them the same length! For example, treat 4.3 as 4.30 when adding to 5.15. The zeros don't change the value but help with alignment.

How do I know where to put the decimal point in my answer?

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The decimal point in your answer goes directly below the decimal points in the numbers you're adding. If they're properly aligned, your answer's decimal will line up too!

Can I check my answer without doing the problem again?

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Yes! Use estimation: round each number to the nearest whole number and add. 4.34 4.3 \approx 4 and 5.15 5.1 \approx 5 , so 4+5=9 4 + 5 = 9 . Your answer of 9.4 should be close to 9.

What does this problem teach me about money?

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This shows how to calculate total costs when shopping! In real life, you'll add prices with decimals (cents) all the time. Practice with money amounts makes decimal addition more meaningful.

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