Maths practice for 12-year-olds - page 234 of 348

Number of problems found: 6954

Children 6377
There are 29 children in the class. The number of children enrolled in front of Ema is six less than behind her. How old is Ema?
Possibilities 6370
They sold three Škoda cars in one day at the car dealership. After rounding the entire amount to the nearest ten thousand, the store used CZK 900,000. Please write at least five possibilities of how much they could take.
One-quarter 6369
According to research, one-quarter of pupils will encounter drugs at the end of primary school. Of this number, 40% of pupils try the drug. How many students attend Year 9 if 12 have signed up to use drugs?
Centimeters 6366
The weight of the pupil and the chair is 52 kg. The area of the contact surfaces of the chair with the floor is 12 square centimeters. What pressure does the chair put on the floor?
Horizontal 6365
The tank's weight is 36 t, and the total contact area of the belts with the ground is 4 square meters. What pressure does the tank cause on a horizontal surface?
Thomas
Thomas lives 400 meters away from Samko, Robo from Thomas also 400 m, and Samko from Robo 500. Anton lives 300 meters away from Robo, further than Samko. How far away lives Anton from Rob?
Approximately 6361
The glass paperweight has the face of a sphere with a radius of 4 cm. Estimate and then calculate its weight. The density of glass is approximately 3800 kg/m³.
Hours 3
How many hours are in 3 2/3 days?
The rainwater
The rainwater container has the shape of a block whose bottom has dimensions of 4.5 m and 3.5 m. It is partially filled with water. What is the level if there is 189 hl of water in it?
Basen
How many square meters of tiles do we need to tile the walls and floor of the pool, 15 meters long, six meters wide, and two meters deep?
Product 6352
There was an offer for item B: If you take six pieces, you only pay for four. One piece of this product costs 7 euros. Maria took 31 pieces of this product to her basket. How many euros did she pay for this item?
Three-fifths 6349
There are 600 employees in a certain company. Last year, three-fifths of them took a language course. This year, the number of employees with the course increased by 40. What proportion of the employees now has a language course?
Diameter 6348
How many m did a wheel with a diameter of 22dm pass if it stopped after 30 turns?
Sidewalk 6347
A sidewalk is 70 cm wide around the circular law and has a radius of 2.3 m. How many square meters does the sidewalk have?
Part-timers 6344
Certain work was to be done by 21 workers during an eight-hour workday, due in 12 days. After five days, temporary workers came to their aid. They all worked together for 7 hours a day and finished the job in 6 days. How many part-timers were there?
Unknown number
Find a number that is by eight larger than its third.
Volcano
The volcano's crater is approximately in the shape of a cone with a base of 3.1416 square miles. The crater's depth is 1500 ft. How many cubic yards of earth would be required to fill this cavity?
Decimetres 6341
We cut identical cubes with an edge length of 2 cm from two corners from a wooden cube with an edge of 0.6 decimetres. How many cubes with an edge length of 2 cm can still be cut from a wooden cube?
Trapezoid - sides
Calculate the unknown side and the area of the ABCD trapezoid if you know: side a = 7.5 side b = 3.6 side d = 4.4 height v = 3.4 circumference o = 19 c =? S =?
Circular arc
Calculate the length of the circular arc if the diameter d = 20cm and the angle alpha = 142 °

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