Maths practice for 14 year olds - page 154 of 361
Number of problems found: 7217
- Roof cardboard
The roof of the prefabricated holiday cottage has the shape of a regular quadrilateral pyramid with a length of the base edge of 8 meters and a height of 9 m. How many square meters of cardboard are needed to cover the roof? - Linden tree percentage
The graph shows the distribution of the number of all trees by species that the volunteers planted in the city park. What percentage of the total number of planted trees are lindens? Oak 23 pieces Maple 12 pieces Linden 15 pieces - Inequality natural number
Write the smallest natural number satisfying the inequality: 5. (2x-1) - Skier percentage calculation
Of the 150 children participating in the ski course, 20 were excellent skiers, 35 were good, 40 were average, and the rest were beginners. Calculate what percentage each skier represents. - Tournament match calculation
The long-term volleyball tournament is played one-on-one. So far, 11 teams have entered the competition. How many matches will be lost when two teams unsubscribe? - Line ratio division
Draw the line AB = 14 cm and divide it by the reduction angle in the ratio of 2:9. - Space diagonal angles
Calculate the angle between the body diagonal and the side edge c of the block with dimensions: a = 28 cm, b = 45 cm, and c = 73 cm. Then, find the angle between the body diagonal and the plane of the base ABCD. - Ascend vs. descent
Which function is growing? a) y = 2-x b) y = 20 c) y = (x + 2). (-5) d) y = x-2 - Hydrostatics
A) Calculate the hydrostatic pressure at the bottom of the Mariana Trench. The density of seawater is 1,030 kg/m³. What depth do you need to look up in an atlas or on the Internet? B) Calculate the pressure force acting on a submarine with a surface area - Concrete column
A concrete column for a motorway bridge is a cuboid with dimensions 1 m × 0.8 m × 25 m. A crane must lift it to a height of 20 m. What is the minimum power of the crane's engine if the lift takes 2 minutes? - Grandmother - money
On a school trip, Šárka received pocket money from her grandmother for small expenses. On the first day, she spent 20% of it and was left with 320 CZK. Calculate the amount of Šárka's pocket money. - Natural number creation
How many natural numbers can you make from the digits in 4052? No digit may be repeated in the number entry. Sort the numbers in ascending order of size. - Wafer filling weight
The packaging of Horalka says, "A wafer with peanut cream filling (72%) in cocoa icing." If one wafer weighs 50 g, how many kilograms (kgs) fill one package containing 56 pieces of this wafer? - Railway embankment
The railway embankment section is an isosceles trapezoid, and the bases' sizes are in the ratio of 5:3. The arms have a length of 5 m, and the embankment height is 4.8 m. Calculate the size of the embankment section area. - Original plan
Gardeners planted 16% more currant bushes than initially planned. In total, they planted x = 435 shrubs. What was the original plan? - The pyramid
The pyramid with a square base is 50 m high, and the sidewall height is 80 m. Find the edge of the base of the pyramid. - Pentagonal pyramid
Find the volume and surface of a regular pentagonal pyramid with a base edge a = 12.8 cm and a height v = 32.1 cm. - Block volume calculation
Block area: S = 376 cm² the sides are in the ratio a: b: c = 3:4:5 calculate its volume - Team success rate
Two handball teams practiced shooting free throws. The first team hit the goal 39 times out of 68 attempts. The second team hit the goal 36 times out of 89 attempts. Express the success rate of each team as a percentage. - Secondary school
Half the pupils want to study at the secondary school, 1/4 at the apprentice, and 1/6 at the grammar school. Three pupils do not like to learn. How many students are in the class?
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