Percent practice

Percentage is a way of expressing a number, especially a ratio, as a fraction of 100. See also our verbal problems in percent or
examples1, examples2, examples3, examples4, examples5.

Calculate:

The number of examples:
Range of values:
Complexity:

57	-	70%	+	90%	=
19	-	70%	+	50%	=
87	+	42%	+	60%	=
40	+	41%	+	20%	=
87	+	36%	-	50%	=
14	+	21%	-	50%	=
97	-	94%	+	60%	=
85	-	39%	-	10%	=
34	-	78%	+	60%	=
100	-	86%	+	10%	=

Percentage in word math problems

• Stamps collection
  Together, Peter and Jan had 52,000 stamps in their collection. To compete with their friend, they must have 56700 stamps. They agreed that Peter would increase his collection by 8 percent and Jan would give 10 percent more than he has. How many stamps did
• Sphere fall
  How much percent fall volume of a sphere if the diameter decreases 3×?
• Extreme temperatures
  The USA hit an extreme heat wave. Calculate the percentage of the air temperature change from normal summer temperature 25 °C to 38 °C.
• Shooter
  The probability that a skilled shooter hits the centre of target zone I is 0.13. The probability of hitting inner circle II is 0.58. What is the probability that the shooter hits zone I or zone II?
• School - boys:girls
  In a school, 10% of the boys is equal to 1/4 of the number of girls, and 10% of the number of girls is equal to 1/25 of the boys. Find the ratio of the number of boys to girls.
• Stock market 3
  Because of a political crisis, the country's stock market index dropped by 600 points. Before the crisis, the country's stock market was performing well at 8,000 points. By how many percent did the country's stock market index points drop?
• Vinegar
  We need to dilute 36 litres of 9.1% vinegar solution to a 4.5% solution. How much water must be added?
• Climb
  The road sign that informs the climb is 10.3%—the car drives 10 km along this road. What is the height difference that the car went?
• Efficiency
  A certain device consumes 50 kW and delivers 17 kW. Find its efficiency.
• Fertilizer
  Mr. Gherkin uses for fertilization 7% solution of fertilizer. 9 liters of it still left. How much water must be added to the solution to make only the 4% solution?
• Unions
  Calculate how much money per year would go to the treasury of unions if 396 thousand employees join unions with an average net salary of 993 euros and if union membership costs 1% of the net monthly salary.
• Deposit
  If you deposit 881 euros at the beginning of each year, how much money do we have at 1.6% (compound) interest after 8 years?
• Ethnicity
  The share of ethnicity XY is 73%, which is 1/5 more than in the prewar period. What was the share of that ethnicity in the prewar period?
• New refrigerator
  The new refrigerator sells for 836 Euro. Monday will be 25% discount. How much will Euro save, and what will be the price?
• Dividing money
  I have CZK 6,155, and I need to divide it as a percentage into two outstanding amounts: CZK 12,000 and CZK 35,000. How much money will I send to each of them? Thank you for your answer.

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