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:

100	-	30%	=
60	-	20%	=
45	-	80%	=
35	+	80%	=
65	+	60%	=
60	-	90%	=
85	+	80%	=
12	-	50%	=
100	-	20%	=
55	+	60%	=

Percentage in word math problems

• Demographics
  The population grew in the city in 10 years from 30000 to 34000. What is the average annual percentage increase in population?
• Accidents
  The count of accidents in 1991 caused 8444 women, which is 9%. How many men caused the accidents?
• Green - Red
  We have 4 bags. Each consists of one green and 2 red balls. From each, we pull just one ball. What is the probability that we don't pull any green ball?
• UV radiation
  The glass of 1 mm thickness absorbs 5.3% of UV radiation passing through. How many percent of UV rays absorb glass with a thickness of 2.3 cm, made from 1 mm thick those glasses?
• Gold coin
  The gold coin contains 966 permille pure gold, which is 8.7 g. What is the weight of the coin in grams?
• Climb in percentage
  The height difference between points A and B is 475 m. Calculate the percentage of route climbing if the horizontal distance between places A and B is 7.4 km.
• Earth's surface
  The greater part of the Earth's surface (r = 6371 km) is covered by oceans; their area is approximately 71% of the Earth's surface. What is the approximate area of the land?
• Nectar
  Nectar collected by bees contains 70% water. The nectar of the same process produces honey which has 19% water. How many kilograms of nectar do bees need to collect to make 1 kg of honey?
• Backpack
  A large backpack costs CZK 1352. Little is 35% cheaper. How much do we pay for five large and two small backpacks?
• Stock materials
  The company has an actual stock of materials of EUR 1,568,900, of which 8.6% is accounted for by excess stock. How much is Eur?
• Water containers
  One m³ of wood weighs 650 kg, of which 12% is water. How many 10-liter containers do we need for this amount of water?
• Solution dilution
  1.5 kg of a 20% NaCl solution should be diluted to a 10% solution with water. How much water will we need, and how many kilograms of diluted solution will we get?
• The deposit
  A deposit of € 2,612.5 was placed for one year at an annual rate of 4.5%. After one year, the amount rose to € 2,612.5. Find the initial deposit.
• Weightlifter
  Weightlifter lifted 75% of its weight. Determine how much weight is lifted when he weighs 132 kg.
• Number calculation
  Specify a number that is 61% less than 10².

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