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:

70	+	40%	+	70%	+	25%	=
70	-	60%	+	50%	-	40%	=
86	-	50%	+	40%	-	70%	=
40	+	60%	-	50%	+	30%	=
50	-	10%	+	50%	-	55%	=
90	-	30%	-	60%	-	95%	=
10	+	50%	-	90%	+	75%	=
70	-	30%	-	90%	+	20%	=
82	-	50%	-	80%	+	50%	=
65	+	40%	-	80%	+	15%	=

Percentage in word math problems

• Volatile percents
  Peter is working as a forex trader. He suffered a loss of 60.1 percent. Calculate what percentage you must now earn to lift from loss.
• 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
• Dice
  How many times must you throw the dice, and was the probability of throwing at least one pětky greater than 70%?
• Election mathematics
  In elections, 8 political parties received the following shares of votes: strana A ; 56 % strana B ; 11.9 % strana C ; 11.7 % strana D ; 8.8 % strana E ; 6.3 % strana F ; 5.1 % strana G ; 0.2 % Calculate what share each party would obtain in parliament if
• Lunch for free
  Meal vouchers are a tax-free employee benefit widely used in Slovakia. The company issuing meal vouchers charges a 4.3% fee on their total value. Calculate how much an employee effectively receives if they get 201 meal vouchers worth 3.2 € each per year.
• Sphere fall
  How much percent fall volume of a sphere if the diameter decreases 3×?
• Discounts on rail (ZSSK)
  The railway company ZSSK offers a discount of 40% (SENIOR RAILPLUS) for 9.9 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 5 Eur per week.
• Human buying irrationality
  I longer watch processors for Socket A on the secondhand market, Athlon XP 1.86GHz with a PR rating of 2500+ costs $7, and Athlon XP 2.16Ghz with a PR rating of 3000+ currently costs $16. Calculate: About what percentage of the Athlon XP 2.16Ghz is more p
• Alcohol 2
  Two types of alcohol, one 46% and second 64%, give 16 liters of 54% alcohol. How many liters of each type are in the mixture?
• Barrel of oil
  The barrel of oil weighs 283 kg. When it molded 26% oil, it weighed 216 kg. What is the mass of the empty barrel?
• Demographics
  The population grew in the city in 10 years from 30000 to 34000. What is the average annual percentage increase in population?
• Event probability
  The probability of event N in 5 independent experiments is 0.4. What is the probability that the event N occurs in one experiment (chance is the same)?
• Cone and cube
  About what percentage has cone with base radius r larger volume than a same high cube with square base with edge length r?
• Rectangles
  How many rectangles with an area of 8855 cm² have sides that are natural numbers?
• River
  Calculate the average gradient in per mille of river Hudson, given that along a 952 km section the water flows from 1231 m above sea level down to 131 m above sea level.

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