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Worksheet: Finding Percents Mentally

Q1:

By dividing by 10 and then multiplying by 3, calculate 3 0 % of 90 mentally.

Q2:

Determine the total cost for a shirt if its regular price is $24 and the sales tax is 7 1 2 % .

Q3:

Given a student answers 5 0 % of the questions on an exam correctly and 10 questions incorrectly, what was the total number of questions on the exam?

Q4:

If there is a 2 0 % discount on a TV set, calculate the percentage by which the sale price must be increased in order to get the original price.

Q5:

If Daniel answered 6 0 % of the questions on his quiz correctly, and the quiz had 10 questions, determine the number of questions he answered correctly.

Q6:

The value of Scarlett’s car, which was $ 1 2 0 0 , has decreased by 1 5 % . What is her car worth now?

Q7:

By dividing by 4, calculate 2 5 % of 900 mentally.

Q8:

By dividing by 2, calculate 5 0 % of 32 mentally.