Let's solve each of the decimal word problems step by step.
---
Problem 1:
John ran for 3.6 km in a 5 km run. How much more does he have to run now to complete the 5 km run?
#### Solution:
- Total distance of the run: \( 5 \) km
- Distance John has already run: \( 3.6 \) km
- Distance remaining to complete the run:
\[
5 - 3.6 = 1.4 \text{ km}
\]
#### Answer:
\[
\boxed{1.4}
\]
---
Problem 2:
Anne had 1.5 liters of water. How much more does she have to drink if she has to complete her 2-liter bottle?
#### Solution:
- Total capacity of the bottle: \( 2 \) liters
- Amount of water Anne currently has: \( 1.5 \) liters
- Amount of water she needs to drink to complete the bottle:
\[
2 - 1.5 = 0.5 \text{ liters}
\]
#### Answer:
\[
\boxed{0.5}
\]
---
Problem 3:
Stella saw a shoe for $7.5. She gave the shopkeeper $10. How much will he return her?
#### Solution:
- Cost of the shoe: \( \$7.5 \)
- Amount Stella gave: \( \$10 \)
- Change to be returned:
\[
10 - 7.5 = 2.5 \text{ dollars}
\]
#### Answer:
\[
\boxed{2.5}
\]
---
Problem 4:
Chan bought 2 tickets of $3.5 and gave the ticket attendant $10. How much change will he get back?
#### Solution:
- Cost of one ticket: \( \$3.5 \)
- Number of tickets bought: \( 2 \)
- Total cost of the tickets:
\[
3.5 \times 2 = 7 \text{ dollars}
\]
- Amount Chan gave: \( \$10 \)
- Change to be returned:
\[
10 - 7 = 3 \text{ dollars}
\]
#### Answer:
\[
\boxed{3}
\]
---
Final Answers:
1. \(\boxed{1.4}\)
2. \(\boxed{0.5}\)
3. \(\boxed{2.5}\)
4. \(\boxed{3}\)
Parent Tip: Review the logic above to help your child master the concept of decimal word problem worksheet.
