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Adding Subtracting Decimals

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Adding and Subtracting Decimals

🎯 WALT: Add and subtract decimal numbers accurately

Success Criteria:

I can line up decimal points correctly

I can estimate my answer first

I can check my work using inverse operations

I can add and subtract decimals to 3 decimal places

📊 Part 1: Estimation and Basic Operations

1. Estimate first, then calculate: 4.6 + 2.8

My estimate: _______ Exact answer: _______

2. Shopping scenario: You buy a drink for $3.45 and a sandwich for $7.80. How much do you spend in total?

Estimate: _______ Exact answer: $ _______

3. Calculate: 12.75 - 8.4

Remember to line up the decimal points!

4. Temperature change: The temperature was 15.7°C in the morning and dropped by 3.25°C. What is the new temperature?

New temperature: _______ °C

🚀 Part 2: Challenge Problems

5. Three decimal places: 24.567 + 15.89 + 3.2

Hint: Add zeros where needed to line up decimal places

6. Distance problem: Sarah runs 2.75 km on Monday, 3.8 km on Wednesday, and 1.95 km on Friday. How far does she run in total?

Total distance: _______ km

7. Money problem: James has $25.60. He buys a book for $12.95 and lunch for $8.75. How much money does he have left?

Money remaining: $ _______

8. Check your work: For question 7, use addition to check your subtraction answer.

Check: $12.95 + $8.75 + your answer = $25.60 ✓

9. Extension Challenge: Find the missing number: 15.678 - _______ = 7.29

Missing number: _______

10. Real-world application: A recipe calls for 2.5 cups of flour, but you only have 1.75 cups. How much more flour do you need? If you then find an extra 0.8 cups, will you have enough?

More flour needed: _______ cups

Total flour after finding extra: _______ cups

Do you have enough? _______

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