Maths practice for 12-year-olds - page 190 of 351
Number of problems found: 7018
- Surface of the cube
Find the surface of the cube that has volume 1/1m³ 2/0.001 m³ 3/8000 mm3 - Circular track
The competitor runs on a circular track with a radius of 86 m. How many meters will he run in five rounds? (Solution and detailed procedure) - Cylinder surface calculation
The cylinder has a volume of 2000 liters and a height of 8 dm. What is its surface? - Motorcyclist distance calculation
The motorcyclist travels at a speed of 48 km/h. Will he drive at this speed in 400 minutes? Km - Truck meeting calculation
Two trucks drove at the same time from two places 570 km apart. The first will travel 61 km in an hour, and the second 81.5 km. How long before they meet? - Individual gadens
The size of the five gardens is 13:10:9:8:7. Calculate the areas of individual gardens if you know that the middle area is 720 m². - Ant tree height
The ant looks at a 45-degree angle at the top of the tree, 15 m away from the tree. How tall is the tree? - Class boy girl
There are 24 students in the class, and 5/8 of them are girls. Which of the following statements is true: And there are 15 boys in the class, B there are more boys than girls in the class, There are 9 boys and 15 girls in C's class - Block width calculation
The volume of the block is 72 liters, the height is 6dm, and the length is 4dm. What is the width of the block? - Ferry capacity calculation
The ferry transporting people across the river has a transport area of 17mx25 m. How many people can carry a maximum of 50 people per 1 person? - A library
A library has 12,500 fiction books and 19,000 nonfiction books. Currently, 2/5 of the fiction books are checked out, and 2/5 of the nonfiction books are checked out. Of the books checked out, only 1/10 are due back this week. How many books are due this w - Reservoir height calculation
The block-shaped reservoir has 147 hl of water and is 3.5 m long and 2.8 m wide. Calculate its height. - Negative and postcard
The image on the negative has dimensions of 36x24 mm and is enlarged to a postcard format of 13.5x9 cm. In what proportion have the lengths increased? In what proportion has the image area increased? - Cloth package calculation
The cloth package was stained black: one-third and one-quarter black, the remaining 8 meters gray. How many meters of cloth was in the box? - Oval track length
Calculate the length of the oval race track, which has two straights of 100 m, and the diameter of the curves is 52 m. - The length
The length of the circle is 24 cm. What is the circular arc length of the corresponding angle of 30°? - Room people capacity
The room is 240 cm high and has a volume of 48 m³. How many people can work in it when there is 7 m² of floor space per person? - Bonus payment distribution
Four people were paid bonuses, so each subsequent person received half as much as the previous one. How much did everyone receive if the company paid out a total of CZK 6,500? - Body density floating
A body weighing 2 kg with a 7.8 g / cm³ density is placed in water. Does the body sink? Will he swim (1 = Yes, 0 = No)? - Pool pipe filling
A block-shaped pool with bottom dimensions of 12 m and 20 m and a depth of 2 m is filled with two pipes. The first pipe flows 6 l of water per second, the second 2.4 hl per minute. How many hours and minutes will the pool be filled 40 cm below the edge?
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