Let’s go through each problem one by one, step by step.
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Problem 1:
> I have $500 which I leave in a savings account for a year. The interest rate on the account is 3%. How much will I have at the end of the year?
Step 1: Find 3% of $500.
3% = 3/100 = 0.03
0.03 × 500 = 15
Step 2: Add that to the original amount.
500 + 15 =
515
✔ Final answer for Problem 1:
$515
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Problem 2:
> A laptop normally costs $640. It is reduced by 25% in a sale. What is the sale price of the laptop?
Step 1: Find 25% of $640.
25% = 25/100 = 0.25
0.25 × 640 = 160
Step 2: Subtract that from the original price.
640 - 160 =
480
✔ Final answer for Problem 2:
$480
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Problem 3:
> Tyson scores 75 points in a spelling test. His score improves by 20% the following week. What was his score?
Step 1: Find 20% of 75.
20% = 20/100 = 0.20
0.20 × 75 = 15
Step 2: Add that to the original score.
75 + 15 =
90
✔ Final answer for Problem 3:
90 points
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Problem 4:
> Fraser cycles 500 miles in one week. He cycles 20% fewer miles the following week. How far did he cycle?
Step 1: Find 20% of 500.
20% = 0.20
0.20 × 500 = 100
Step 2: Subtract that from the original distance.
500 - 100 =
400
✔ Final answer for Problem 4:
400 miles
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Problem 5:
> A Boeing 747 has a mass of 250,000 kg. A smaller jet has 40% less mass than the Boeing. What is the mass of the smaller jet?
Step 1: Find 40% of 250,000.
40% = 0.40
0.40 × 250,000 = 100,000
Step 2: Subtract that from the original mass.
250,000 - 100,000 =
150,000
✔ Final answer for Problem 5:
150,000 kg
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Problem 6:
> The dress shop in Marmalade Mall has 50 dresses in stock. The next week they had 40% more new stock. How many dresses are there now?
Step 1: Find 40% of 50.
40% = 0.40
0.40 × 50 = 20
Step 2: Add that to the original number.
50 + 20 =
70
✔ Final answer for Problem 6:
70 dresses
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Final Answer:
1. $515
2. $480
3. 90 points
4. 400 miles
5. 150,000 kg
6. 70 dresses
Parent Tip: Review the logic above to help your child master the concept of percent of change worksheet with answers.
