Average – Speed Tricks and Fast Calculation
Solve average problems quickly using shortcut formulas and smart techniques.
Core Concept
Average = Total Sum ÷ Number of values
Shortcut Trick 1
Example: Average of 10, 20, 30, 40
Method:
Sum = 100 → ÷4 = 25
Shortcut Trick 2 (Equal Distance)
Example: 20, 30, 40
Answer: Middle value = 30
Shortcut Trick 3 (Change Method)
Example: Average of 5 numbers = 20
One number increases by 10
New Average:
Increase = 10 ÷ 5 = 2 → New average = 22
Shortcut Trick 4 (Replacement)
Example: Replace 30 with 50 in average of 5 numbers
Change:
Difference = 20 → 20 ÷ 5 = 4 increase
Exam Level Questions
1. Average of 5 numbers is 20 → Total?
Answer: 100
2. Total is 200 for 10 numbers → Average?
Answer: 20
3. Average of 4 numbers is 25, one removed → new avg 20 → removed number?
Answer: 40
Common Mistake
Students forget to adjust total when values change.
Speed Tip
Focus on total sum rather than calculating each number individually.
Shaktimatha Learning
Speed Maths • Bank Exam Preparation
Speed Maths • Bank Exam Preparation
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