Let’s solve each problem one by one, step by step.
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Problem 1:
John ran for 3.6 km in a 5 km run. How much more does he have to run?
We subtract what he already ran from the total distance:
5.0 - 3.6 = ?
Think of it like this:
5.0 minus 3.6 → take away 3 first → you get 2.0
Then take away 0.6 more → 2.0 - 0.6 = 1.4
✔ So, John has
1.4 km left to run.
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Problem 2:
Anne had 1.5 liters of water. She needs to drink enough to finish her 2-liter bottle. How much more must she drink?
Total needed: 2.0 liters
Already drank: 1.5 liters
So, 2.0 - 1.5 = ?
2.0 minus 1.5 is the same as 20 tenths minus 15 tenths = 5 tenths → 0.5
✔ Anne needs to drink
0.5 liter more.
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Problem 3:
Stella bought a shoe for $7.5 and gave $10. How much change will she get?
She paid $10.00
Cost was $7.50
Change = 10.00 - 7.50
10.00 minus 7.00 = 3.00
Then minus 0.50 more → 3.00 - 0.50 = 2.50
✔ Stella gets
$2.50 back.
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Problem 4:
Chan bought 2 tickets at $3.5 each. He gave $10. How much change?
First, find total cost:
2 × $3.5 = ?
3.5 + 3.5 = 7.0 → so total cost is $7.00
He gave $10.00
Change = 10.00 - 7.00 = 3.00
✔ Chan gets
$3.00 back.
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Final Answer:
1. 1.4 km
2. 0.5 liter
3. $2.50
4. $3.00
Parent Tip: Review the logic above to help your child master the concept of adding decimals word problems worksheet.
