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Decimal Addition and Subtraction

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Decimal Addition and Subtraction worksheet preview

Decimal Addition and Subtraction

Calculator and decimal numbers illustration

📊 Part 1: Decimal Operations

1. Calculate the following decimal additions. Show your working by lining up the decimal points.

a) 12.45 + 7.8 = _______

b) 9.367 + 4.52 = _______

c) 15.6 + 23.847 = _______

2. Calculate the following decimal subtractions. Show your working.

a) 25.7 - 8.43 = _______

b) 50.00 - 12.675 = _______

c) 18.254 - 9.8 = _______

3. Before calculating, estimate each answer by rounding to the nearest whole number. Then calculate the exact answer.

a) 14.78 + 6.23

Estimate: _______ + _______ = _______

Exact answer: _______

b) 31.45 - 18.67

Estimate: _______ - _______ = _______

Exact answer: _______

💰 Part 2: Real-World Problems

4. Sarah bought a sandwich for $8.75, a drink for $3.50, and a muffin for $4.25. How much did she spend in total?

Calculation:

Total cost: $ _______

5. Tom had $50.00. He bought a book for $18.95 and a pen for $7.50. How much change did he receive?

Calculation:

Change received: $ _______

6. In a science experiment, Emma measured three lengths: 12.45 cm, 8.7 cm, and 15.382 cm. What is the total length when all three pieces are joined together?

Calculation:

Total length: _______ cm

7. A recipe calls for 2.75 kg of flour, but Jake only has 1.8 kg. How much more flour does he need to buy?

Calculation:

Additional flour needed: _______ kg

🎯 Part 3: Problem Solving

8. Which calculation method is most efficient for adding decimals? Circle your answer.

Line up the decimal points vertically

Add from left to right

Convert to fractions first

Use a calculator only

9. Explain in your own words why it's important to line up decimal points when adding or subtracting decimals.
10. Create your own word problem involving decimal subtraction with money. Then solve it.

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