Decimal Addition Subtraction Worksheet

Name:

Date:

🎯 WALT: Add and subtract decimal numbers accurately

Success Criteria:

I can line up decimal points correctly
I can estimate my answer first
I can add and subtract decimals to three decimal places
I can check my work using inverse operations

📊 Page 1: Number Problems

Instructions: Line up the decimal points. Estimate first, then calculate.

1. 4.356 + 2.78 = _________

Estimate: _______ + _______ = _______

2. 9.45 - 3.127 = _________

Estimate: _______ - _______ = _______

3. 15.6 + 8.294 + 3.75 = _________

Estimate: _______ + _______ + _______ = _______

4. 12.008 - 7.35 = _________

Estimate: _______ - _______ = _______

🛒 Page 2: Easy Word Problems

5. Sarah bought a drink for $3.45 and a sandwich for $6.80. How much did she spend in total?

Estimate: $ _______

Answer: $ _______

6. A piece of rope is 8.75 metres long. If 2.3 metres is cut off, how much rope is left?

Estimate: _______ metres

Answer: _______ metres

7. Tom's height is 1.65 metres and his sister is 1.48 metres tall. What is the difference in their heights?

Estimate: _______ metres

Answer: _______ metres

🧮 Page 3: Harder Word Problems

8. Emma is saving for a bike that costs $245.99. She has already saved $127.50. Her grandmother gives her $35.75 for her birthday. How much more money does she need?

Step 1 - Total money Emma has: $ _______

Step 2 - Money still needed: $ _______

9. A recipe calls for 2.375 kg of flour, 1.25 kg of sugar, and 0.875 kg of butter. If the total ingredients should not exceed 5 kg, how much weight is left for other ingredients?

Step 1 - Total weight of main ingredients: _______ kg

Step 2 - Weight left for other ingredients: _______ kg

⭐ Page 4: Challenge Problems

10. A builder needs to cut three pieces of timber from a 4.5 metre plank. The pieces are 1.275 m, 0.95 m, and 1.348 m long. After cutting, how much timber will be left? (Remember: each cut wastes 0.003 m of timber)

Step 1 - Total length of pieces: _______ m

Step 2 - Total waste from cuts: _______ m

Step 3 - Timber left: _______ m

11. Extension: Calculate: 15.678 - 9.234 + 7.89 - 3.456 = _______

Show your working step by step:

12. Check Your Learning: Choose the correct answer for 8.45 + 3.678

12.128

11.228

12.028

11.128

Explain how you checked your answer: ________________________________