Maths practice for 12-year-olds - page 176 of 355
Number of problems found: 7084
- Quadrilateral prism
Calculate the surface of a quadrilateral prism according to the input: Area of the diamond base S1 = 2.8 m2, length of the base edge a = 14 dm, the prism height 1,500 mm. - Mug volume calculation
What is the volume V (dl) of a cylinder-shaped mug if it is 8cm high and its figure is 7cm? - Twice of radius
How many times does the surface of a sphere decrease if we reduce its radius twice? - Flowerbed stone calculation
The gardener filled the flowerbed with crushed stone in the shape of an equilateral triangle with an 8-m-long side. If 25 kg of crumb was consumed per 1 m² of the area, how much crumb was used for the whole flower bed? - Triple density
How many times does the density of a steel pipe increase if we triple its length? - Escalator distance calculation
The escalator in the subway is moving at a speed of 0.7 m/s. Determine his debt if the time from the boarding to the disembarkation of the passenger elapses 62.3 s - Divide in ratio
Line segment AB is 12 cm long, divided in a ratio of 5:3. How long are the individual parts? - The sum
The sum of five consecutive odd numbers is 75. Please find out the sum of the second and fourth of them. - Save trees
Twenty-five tons of old paper will save 1,600 trees. How many tons of paper are needed to save the 32 trees in the park? - Aquarium height
How high does the water in the aquarium reach if there are 36 liters of water in it? The length of the aquarium is 60 cm, and the width is 4 dm. - Cube surfce2volume
Calculate the volume of the cube if its surface is 150 cm². - Number multiplication puzzle
The number x decreases by 10, the result is multiplied by six, and you get the number 18 - Pizza palace
Josh is at Enzo's Pizza Palace. He can sit at a table with 5 of his friends or at a different table with seven friends. The same size pizza is shared equally among the people at each table. At which table should Josh sit to get more pizza? (write the answ - Room wallpaper calculation
How many square meters of wallpaper will we need to cover the walls of a room with dimensions of 3 m and 4 m if the room height is 2.5 m? A door with dimensions of 90 cm and 2 m leads to the room. There is one window 1 m wide and 1.5 m high. - Concrete hatch
The concrete hatch for a round well has a diameter of 1300 mm and a thickness of 80 mm. Determine its weight in kg if the density of the concrete is 2545 kg/m3 - Bun basket calculation
There were buns in the basket on the table. Josef ate half of the half, Eva ate the rest, Katka ate two buns, and Dunčo ate a quarter. How many buns were on the table? - Can model height
The can of juice is 15 cm high. For advertising purposes, they made a model that can enlarge in a ratio of 5:3. How tall is the advertising? - Pizza circumference
Calculate the circumference of a pizza with a diameter of 62 cm. How big is the plate on which it is placed when it covers it? - Divisors of 560
Which of the numbers 5, 6, 7, 14, and 15 are divisors of 560? Please justify the answer. - Four-digit numbers How many four-digit numbers can we make from the numbers 2, 6, 3, 5, 1, and 9 if we cannot repeat the numbers in the number?
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