Maths practice for 12-year-olds - page 164 of 350

Number of problems found: 6999

Students 32361
Seven of the 28 pupils cannot ski, and x pupils cannot swim. How many students in this class can swim?
The recommended
The recommended price of the novel "Laughing Sun" is 285 SKK. The bookseller bought 60 pieces of the novel at the wholesale store and paid 82% of the recommended price (18% is his profit for selling books). He sold 55 pieces of the novel and sold the rema
Electromagnetic 32291
The electromagnetic signal sent by the radar bounced off the plane and returned in 60 microseconds. How far is the plane?
Pedestrians 32231
One pedestrian walked the 16km track in 3.12 hours Two pedestrians walked the 18km track in 3.18 hours Which one had a higher average speed on its track?
Proportion 32223
Compare line lengths by ratio and proportion. a) AB = 2 cm, | KL | = 8 cm (b) | EF | = 28 cm, | MN | = 21 cm
Ball-shaped 32173
The inner diameter of the ball-shaped reservoir is d = 12 m. Can it hold 900 m³ of water?
Cross-section 32163
The bottom of the garden pool of circular cross-section has an inner diameter of d = 4 m. The water depth is 0.8 m. How many liters of water can we fill into the pool?
Three-sevenths 32151
Tractor driver plowing three-sevenths of a rope measuring 1.4ha. How many m² of fields do the poor have yet?
Aquarium
How many liters of water can fit in an aquarium measuring 30, 15, and 20 cm?
Malzenice 32021
The area of Malzenice and Trakovic is in the ratio 3:4. The area of Ratkovec and Malzenice is in the ratio 1:4. In what ratio are the areas of Ratkovec, Malzenic, and Trakovic?
Calculate 32011
Calculate the size of the BVC angle if the following applies to the size of the angles: AVB = 37 ° 48 minutes, CVD = 52 ° 30 minutes, AVD = 118 °
Calculate 32001
Calculate the volume of a 1.4 m high hexagonal prism container with a base area of 8300 cm².
Calculate a prism
Calculate the volume and surface area of a prism whose height is 16cm and whose base is a right triangle with sides of 5cm and 12cm and a hypotenuse of 13cm.
Three-quarters of a tank
The oil tank is shaped like a cylinder with a height of 8 m and a diameter of 4 m. It is three-quarters full. How much oil is in it?
Beet harvest
Beet harvest is underway in the field. The beets are transported to 3 different processing plants by 3 trucks. One truck manages to return to the field 3 times in an hour, the second after 30 minutes, and the third has the shortest route, so it turns arou
Children's 31961
The pool for swimmers has dimensions of 25m, 10m, and 2.8m, and the children's pool is only 10m, 4m, and 1m. The pump will change all the water in the swimming pool in 9 hours. How long does it take for the same pump to pump out the water in the children'
Cylinder-shaped 31951
How many kg of paint do you need to buy to paint a 1.5m high cylinder-shaped rainwater cover with a 0.7m radius? We paint the barrel from the outside and inside, and 100 grams of paint is needed to paint 1 square meter.
Reconstruction 31931
During the reconstruction of the apartment, Mr. Čakaj needed to varnish the floors in two rectangular rooms with dimensions of 6.8m x 4.5m and 6m x 3.8m. How many cans of paint did he have to buy if he painted 6m² of the floor with one can?
Isosceles triangle
An isosceles triangle has an angle against the base that measures 55°. What is the size of the angle at the base of an isosceles triangle? (Calculation and procedure)
Six painters
Six painters paint an area of 120 m² in 4 hours. How long does it take for 12 painters to paint 480 m² with the same performance?

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