Percentages - practice for 13 year olds - page 10 of 56
Number of problems found: 1105
- Decrease 80441
By what percent does a cube's volume decrease if its edge length is reduced by a quarter? - One-fifth 80438
By what percent does the area of a square increase if its perimeter increases by one-fifth? - Fertilized 80437
Nitric lime contains an average of 19% nitrogen and 55% calcium oxide. How many grams of nitrogen per 1 m² if we bought a 25 kg package and thereby evenly fertilized a garden of 12 a? - Rectangular 80436
The longer dimension of the rectangular plot was reduced by one-fifth, and the shorter dimension by 8%. By what percentage did the amount of land decrease? What is the perimeter of the fence now if the original dimensions of the fence were 60m and 25m?
- Germination 80433
The germination rate of Hokkaido pumpkin seeds is 92%. The weight of 10 seeds is 1.6 g. How many plants will sprout if we sow 20 g of seeds? - Edwin
Edwin found that 18 out of 24 of her friends have a pet. How many percent of her friends have pets? - Tom sold
Tom sold 75% of his farm, and the number of acres sold was 150. How many acres were there on the farm before selling? - Percentage 80164
I was given a square ABCD 4.2 cm. Find the set of all points that have a distance less than or equal to 2 cm from one of its vertices and lie inside this square. Indicate how much of the square this area occupies as a percentage. - Felix
Calculate how much land Felix Baumgartner saw after jumping from 36 km above the ground. The radius of the Earth is R = 6378 km.
- RT area
A right triangle has an area of 54cm². Calculate the sizes of both legs if the shorter leg is 75% of the size of the longer leg. - Supermarket 79504
The supermarket reduced the original price of the skis by 20% in January. At the beginning of February, they reduced the new price by another 29%. By what percentage were the skis' costs lower than the original price in February? - Yesterday 79344
Petr played Minecraft for 2 hours yesterday. Pavel played 10% longer. How many minutes did Pavel play? - Blackboard 79334
The biology teacher, Carrot, randomly called the students to the blackboard. There were 25 pupils in the class, and Mr. Carrot called Ludek, Silva, and Mathias. What percentage of the total number of students was called today? - Using bicycle
There are 36 pupils in Grade VI Sampaguita. Seventy-five percent of them use a bicycle to go to school. How many pupils are using a bicycle?
- Hand soap
A bottle of hand soap costs $2.50. The same bottle of hand soap went on sale for $2.00. What is the percent decrease in the price of hand soap? - Hypotenuse 78844
Construct triangle KLM if side m=6.5cm, hypotenuse tm=4cm, height to side m: vm=3.2cm - Multiplied 78494
A quarter of an unknown number multiplied by 4 equals 30% of that unknown number. Determine the unknown number. - Soccer season
Joel is training for soccer season. On Monday, Joel exercises for 20 minutes before school, and 25% of that time is spent playing soccer. On Mondays, he exercises for 60 minutes after school, and 40% of that time is spent playing soccer. What is the total - Kilograms 78244
Fresh herbs contain 90% water, dried 10% water. How many kilograms of herbs can we dry from 15 kg of fresh ones?
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