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Decimal Subtraction Vertical Method

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Decimal Subtraction Vertical Method

Decimal Subtraction Vertical Method

Decimal subtraction illustration

📍 Part 1: Aligning Decimal Points

Remember: Always line up the decimal points when subtracting!

1. Rewrite these subtraction problems in vertical form with decimal points aligned:

a) 5.7 - 2.4 = _______

b) 12.85 - 6.32 = _______

c) 9.6 - 4.28 = _______

🧮 Part 2: Simple Decimal Subtraction (No Regrouping)

Instructions: Solve these decimal subtraction problems. Show your working in the boxes below.

2. Calculate the following:

a) 8.9 - 3.5 = _______

b) 15.67 - 12.34 = _______

c) 7.8 - 2.6 = _______

d) 24.95 - 13.42 = _______

🔄 Part 3: Decimal Subtraction with Regrouping

Remember: When the top digit is smaller than the bottom digit, you need to borrow from the next place value!

3. Solve these problems that require regrouping:

a) 6.2 - 3.8 = _______

b) 15.03 - 9.87 = _______

c) 20.4 - 12.9 = _______

d) 18.25 - 9.68 = _______

💰 Part 4: Real-Life Money Problems

Context: Use decimal subtraction to solve these New Zealand money problems.

4. Sarah had $25.75 in her wallet. She bought a book for $12.50. How much money does she have left?

Answer: $ __________

5. A toy costs $18.95. If you pay with a $20.00 note, how much change will you receive?

Answer: $ __________

6. Jake saved $47.80. He spent $29.65 on a new game. How much money does he have remaining?

Answer: $ __________

📏 Part 5: Measurement Problems

Context: Apply decimal subtraction to measurement situations.

7. A piece of rope is 8.75 metres long. If 3.28 metres is cut off, how much rope is left?

Answer: __________ metres

8. The temperature was 18.6°C in the morning. By evening it had dropped by 5.8°C. What was the evening temperature?

Answer: __________°C

✅ Part 6: Estimation and Checking

Strategy: Always estimate your answer first, then check your work!

9. For each problem below, estimate the answer first by rounding to whole numbers, then solve exactly:

a) 16.8 - 9.3

Estimate: _____ - _____ = _____

Exact answer: __________

b) 25.67 - 18.94

Estimate: _____ - _____ = _____

Exact answer: __________

🤔 Part 7: Problem Solving Challenge

10. Circle the correct method for setting up this subtraction problem: 12.5 - 8.73

12.5
- 8.73

12.50
- 8.73

125
- 873

11. Check all the steps you should follow when subtracting decimals vertically:

Line up the decimal points

Add zeros if needed to make equal decimal places

Subtract from right to left

Estimate your answer first

Check your answer makes sense

📝 Part 8: Reflection

12. Explain in your own words how to line up decimal numbers for subtraction:
13. What is one strategy that helps you remember to borrow when subtracting decimals?

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