Part 1: Understanding Decimal Place Value

1. Circle the correct place value for the underlined digit:

3.47

Ones

Tenths

Hundredths

2. Write the decimal number for: 2 ones, 3 tenths, 5 hundredths

3. Fill in the blanks with the correct place value:

In the number 5.68, the digit 6 is in the _________ place and the digit 8 is in the _________ place.

Part 2: Adding Decimals (Same Number of Decimal Places)

4. Solve these addition problems. Show your working:

a) 2.3 + 4.5 = _______

b) 1.25 + 3.42 = _______

c) 6.78 + 2.19 = _______

5. Money Problem: Sarah has $4.75 and her mum gives her $3.50. How much money does she have altogether?

Answer: $ _______

Part 3: Subtracting Decimals (Same Number of Decimal Places)

6. Solve these subtraction problems. Show your working:

a) 7.8 - 3.2 = _______

b) 5.67 - 2.34 = _______

c) 9.45 - 4.23 = _______

7. Measurement Problem: A piece of rope is 8.75 metres long. If 3.25 metres is cut off, how much rope is left?

Answer: _______ metres

Part 4: Real-Life Applications

8. Temperature Problem: The temperature in Sydney was 23.5°C in the morning. It rose by 4.8°C during the day. What was the afternoon temperature?

Answer: _______°C

9. Shopping Problem: Tom buys a sandwich for $6.75 and a drink for $2.50. He pays with a $10.00 note. How much change should he receive?

Total cost: $ _______

Change: $ _______

10. Which of these calculations are correct? Check all that apply:

3.4 + 2.1 = 5.5

7.6 - 3.2 = 4.4

2.25 + 1.50 = 3.75

8.90 - 4.30 = 4.70

Part 5: Mental Strategies

11. Use mental strategies to solve these quickly:

a) 5.0 + 3.0 = _______

b) 8.5 - 4.5 = _______

c) 2.25 + 2.25 = _______

d) 10.0 - 6.3 = _______

12. Explain your strategy for solving 4.6 + 3.2 mentally:

13. Match each problem with its answer:

1. 3.7 + 2.1

2. 6.8 - 2.3

3. 1.25 + 4.50

4. 9.0 - 3.5

A. 4.5

B. 5.75

C. 5.8

D. 5.5

Part 6: Challenge Problems

14. Word Problem: A recipe calls for 2.75 kg of flour. Maria has 1.50 kg of flour at home. How much more flour does she need to buy?

Answer: _______ kg

15. Create your own decimal addition problem using money amounts and solve it:

16. True or False? Circle your answer and explain:

When adding decimals, you must line up the decimal points.

True

False

Explanation: ________________________________________________

Decimal Addition Subtraction Basics

Decimal Addition Subtraction Basics

Part 1: Understanding Decimal Place Value

Part 2: Adding Decimals (Same Number of Decimal Places)

Part 3: Subtracting Decimals (Same Number of Decimal Places)

Part 4: Real-Life Applications

Part 5: Mental Strategies

Part 6: Challenge Problems

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