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anonymous
 one year ago
How can you quickly calculate 20 percent of any bill amount?
anonymous
 one year ago
How can you quickly calculate 20 percent of any bill amount?

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Hero
 one year ago
Best ResponseYou've already chosen the best response.0Suppose you have $25. Move the decimal one place to the left to get 10%. Now you have $2.50 Multiply that by 2 to get 20%. Now you have $5

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0divide by 5 (I suppose).

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.0either way... would have been better using an american computer and keyboard tho. bye:)

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.0Will it be easier to do Hero's method in reverse? ie Double it first and then move the dot?

Hero
 one year ago
Best ResponseYou've already chosen the best response.0If you want to find 30% of $25, again move the decimal one to the left: $2.50. Then multiply by 3 to get $7.50

Hero
 one year ago
Best ResponseYou've already chosen the best response.0The point is, it is possible to do this in your head without a calc.

Hero
 one year ago
Best ResponseYou've already chosen the best response.0Finding percentages of numbers can be a "mental math" activity.
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