Practice Problems
Addition & Subtraction
328 + 467
Solution Steps:
Break into place values: (300 + 400) + (20 + 60) + (8 + 7)
Add hundreds: 300 + 400 = 700
Add tens: 20 + 60 = 80
Add ones: 8 + 7 = 15
Combine: 700 + 80 + 15 = 795
Answer:
795
543 - 268
Solution Steps:
Use place value method
Start with hundreds: 500 - 200 = 300
Then tens: 40 - 60 (need to borrow)
Adjust: 300 becomes 290, 40 becomes 140
140 - 60 = 80
Finally ones: 3 - 8 (need to borrow)
Adjust and complete: 275
Answer:
275
Multiplication
24 × 15
Solution Steps:
Break 15 into (10 + 5)
Calculate 24 × 10 = 240
Calculate 24 × 5 = 120
Add results: 240 + 120 = 360
Answer:
360
32 × 99
Solution Steps:
Think of 99 as (100 - 1)
Calculate 32 × 100 = 3,200
Subtract 32 × 1 = 32
Final answer: 3,200 - 32 = 3,168
Answer:
3,168
Percentages
Calculate 15% of 80
Solution Steps:
Break 15% into 10% + 5%
10% of 80 = 8
5% is half of 10%, so 5% of 80 = 4
Add: 8 + 4 = 12
Answer:
12
What is 25% of 120?
Solution Steps:
25% is one quarter
Divide 120 by 4
120 ÷ 4 = 30
Answer:
30
Division & Business Math
Calculate Earnings Per Share: $12,000 profit ÷ 1,000 shares
Solution Steps:
Convert the problem to: 12000 ÷ 1000
Think of it as moving decimal points: 12000 → 12.0
Final calculation: $12.00 per share
Answer:
$12.00 per share
Profit Margin: $8,000 profit ÷ $20,000 revenue × 100
Solution Steps:
First divide: 8000 ÷ 20000 = 0.4
Convert to percentage: 0.4 × 100 = 40%
This shows a 40% profit margin
Answer:
40%
Cost Per Unit: $5,000 total cost ÷ 250 units
Solution Steps:
Set up division: 5000 ÷ 250
Break down: 5000 = 20 × 250
Therefore: $20 per unit
Answer:
$20
Market Share: 300 sales ÷ 1,500 total market sales × 100
Solution Steps:
Divide: 300 ÷ 1500 = 0.2
Convert to percentage: 0.2 × 100 = 20%
This represents 20% market share
Answer:
20%
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