Maths practice for 12-year-olds - page 197 of 355
Number of problems found: 7083
- Two trains
Two trains departed from City A and City B against each other. They met after some time. The first train took 9 hours to reach city B, and the second took 4 hours to reach city A. In what proportion were the train speeds? - A plasticine
Joseph modeled from plasticine. He used 27g of plasticine to model a 3 cm long cube. How many grams of plasticine will it need to mold cubes with an edge of 6cm? - Length of the edge
Find the length of the edge of a cube with a cm² surface and a volume in cm³ expressed by the same number. - Walking Earth explanation
What allows a person to walk the Earth: a) atmosphere b) Earth response c) feet d) rolling friction - Rocket speed development
The rocket develops a higher speed, which is: a) higher velocity of escaping gases b) higher mass of escaping gases c) greater momentum of escaping gases d) shorter rocket length - Plot
The land is in the shape of a square with a dimension of 22 meters. How much will we pay for the fence around the entire plot? - Equal temperature
We measured the temperatures of the two cities simultaneously. The temperature in town A was 60 degrees and rose at a constant rate of 2 degrees per hour. The temperature in city B was 40° and rose at a constant rate of 10° per hour. Find the time in hour - Flower bouquet calculation
Three-fifths of the flowers are red, and eight flowers are yellow - how many bouquets of red and yellow flowers do they have? - Land fencing cost
The land is in the shape of a square with a side of 65.4 meters. Moreover, 1 meter of mesh costs 2.30 euros. How many euros do we pay for fencing land? - Square area calculation The town square has the shape of a square measuring 510 meters. What is the size of this square?
- Trolleybus meeting time
Trolleybuses on different lines depart from the same terminal station at 4:10 in the morning. The first returns to the final station regularly in 1 hour, the second in 40 minutes, the third in 2 hours, and the fourth in 1 hour and 20 minutes. At what time - Grass seed calculation
We should sow grass in a square-shaped garden with a side of 16.2 m. How many kg of grass seed do we need? One square meter is necessary for 25 grams. - Perimeter of the circle
Calculate the perimeter of the circle in dm, whose radius equals the side of the square containing 0.49 dm². - A square base
A solid right pyramid has a square base. The base edge length is 4 centimeters, and the pyramid's height is 3 centimeters. What is the volume of the pyramid? - Unknown number calculation
Subtract one-sixth of this unknown number from three times the unknown number, and you get the number 17. Calculate the unknown number - Tent air volume
The tent has the shape of a mantle of a regular quadrilateral pyramid with a base edge of 3.5 meters and a height of 2.4 meters. How many cubic meters of air does it contain? - Possible lengths
Find the possible lengths for the third side of a triangle with sides 20 and 18. - Pinwheel probability calculation
Three types of pinwheels are on the tray: two caramel, four coffee, and one vanilla. Jurko chose one dessert. What is the probability that he decided on a coffee pinwheel? - The tourist
The tourist has walked 3/4 of the route. The destination is 12.5 km away. How many kilometers did the route measure? - Orchard tree planting
The orchard measures 24.6 meters x 70 meters. How many trees can we plant in it if everyone needs at least 12 square meters?
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