Maths practice for 12-year-olds - page 57 of 355
Number of problems found: 7090
- Knife meat pressure
Grandma wanted to fry steaks for lunch. So she went to buy a large piece of meat. Calculate the knife's contact area with the meat if the grandmother cut with a force of 220 N and exerted a pressure of 1.83 MPa. - Film screening ratio
162 school pupils took part in the film performance, and the ratio of the number of boys to the number of girls was 7:11. Three boys and four girls left during the screening. Then what was the ratio of the number of boys to the number of girls? Adjust the - Fraction of a kilogram
Write what part of a kilogram is: a) 10 g b) 45 g c) 7 g - Meter fraction parts
Write which part of the subway is: a) 1 mm b) 5 cm c) 38 mm d) 230 cm - What quantity
What quantity of concrete should be ordered for concreting a rectangular family house with dimensions of 15 m × 12.6 m using permanent formwork? The depth of the foundation formed by permanent formwork is set at 80 cm. The concrete used constitutes 80% of - Club members
The fan club has 275 members. Some members went to the match by train. Determine how many members rode when they could fill the wagons with either 60 or 80 seats. - Fraction quotient seventh
Calculate one-seventh of the quotient of the fractions three-quarters and two-thirds. - Number quadruple reduction
I think a number. I reduce its quadruple by 8 and divide the result by 3. I get 100. Which number do I think? - Iron ball
Calculate the radius of an iron ball with a density of 7.8g/cm³ and a mass of 7kg. - Meat price kilograms
3 kg of meat costs €8.10. How many kg of meat can we buy for €27? - Flower bed mesh
A rectangular flower bed, one side formed by a wall, must be fenced off with 8-meter-long mesh. What should the flower bed length be so the area is as large as possible? - Worker job hours
Five workers do a job in 20 hours. How long will it take two workers to do the same job? - Cube cuboid minimum
Let us have a cube whose edge length is expressed in centimeters and is a natural number. What is the smallest number of such identical cubes that can be made into a cuboid with dimensions of 24 cm, 32 cm, and 60 cm? How long will the edge of these cubes - Battery charging capacity
The battery capacity is 50 Ah. With a current of 5A, we charge the accumulator to 100% capacity in 10 hours. To what percentage of capacity can we charge the accumulator with a current of 2A in 15 hours? - Tractor overtaking time
I am passing a tractor whose speed is 20 km/h. The length of the tractor with the siding is 10 m. My speed is 50 km/h. How long will I overtake the tractor? - Missile plane distance
The missile flies towards the plane at a 2000 km/h speed. The speed of the plane is 1000 km/h. The intervention is after 1.5 minutes. How far apart were the rocket and the aircraft in the beginning? - Quadrilateral pyramid
Construct a 3D model of a quadrilateral pyramid with a rectangle base and sides of isosceles triangles, with a volume of 80 cubic cm. I need to know the sides and the height. - Car wheel rotation
The children's car has wheels with a radius of 15 cm, and its speed is 36 km/h. How many times does the toy car wheel turn in a minute at this speed? - Parliament program approval
4/5 MPs took part in the autumn parliamentary meeting. 80% of those present voted for the proposed program. According to the rules, the program can only be approved if at least 60% of all deputies vote for it. Was the program approved or not? - Jana age multiplication
Jana is so many years old this year that if she multiplies her age by seven and adds 9, she gets 100. How old is Jana?
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