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Problem
Calculating percentages like 15% or 18% requires complex mental math.
Solution
Break percentages into easy parts: 10%, 5%, 1%. Then combine them.
Benefit
Calculate any percentage mentally by breaking it into simple components.
Example
15% of 80:
10% = 8
5% = 4
15% = 8 + 4 = 12
18% of 200:
10% = 20
5% = 10
1% = 2
3% = 6
18% = 20 + 10 + 10 - 6 = 36