Maths practice for 12-year-olds - page 169 of 351
Number of problems found: 7018
- Fraction equation solving
Solve the following equation with fractions: (5x + 1) / 3 + (17-x) / 2 = (3x + 1) / 8 + 15 - Calculate
Calculate the surface of a regular eleven-sided prism; if the area of its base is 58 cm2, the edge of the base is 6 cm long, and the height of the prism is 21 cm. - Cycling distance
Daddy cycles the distance. 15 km in three-quarters of an hour. What distance will he travel in an hour? How long will it take for the son to cover this distance, which travels at an average speed of 15 km per hour? - Cone paint calculation
Forty identical traffic cones with base diameter d = 36 cm and height v = 46 cm are to be painted orange on the outside (without base). How much do we pay for paint if we need 500 cm³ of paint to paint 1 m² and 1 liter of paint costs CZK 8? - Square area ratio
The lengths of the sides of the two squares are in the ratio of 5:7. In what proportion will their area be? - Gold cube distribution
The king cannot decide how to distribute 4 cubes of pure gold, which have edges of length 3 cm, 4 cm, 5 cm, and 6 cm, to two sons as fairly as possible. Design a solution so that the cubes do not have to be cut. - Tank painting calculation
We painted a closed cube-shaped oil tank with an edge length of 1.5 meters twice with a protective coating. How many kilograms of paint did we use if 1 kg of paint is enough for 10 square meters? How many liters of oil are in the tank if it is filled to t - Coke and coal
20.1 tons of coke is produced from 30 tons of black coal. How much coke is made from 1 kilogram of coal? - Isosceles trapezoid
Find the area of an isosceles trapezoid with bases of 8 cm and 72 mm. The height of the trapezoid is equal to three-quarters of the longer base. - Right trapezoid
Calculate the area of a rectangular trapezoid whose perpendicular arm is 27 mm long and the bases are 33 mm and 19 mm long. - Class swim calculation
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 - Radar signal distance
The electromagnetic signal sent by the radar bounced off the plane and returned in 60 microseconds. How far is the plane? - Pedestrian speed comparison
One pedestrian walked the 16 km track in 3.12 hours Two pedestrians walked the 18 km track in 3.18 hours Which one had a higher average speed on its track? - Pool water calculation
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? - Field plowing calculation
Tractor driver plowing three-sevenths of a rope measuring 1.4ha. How many m² of fields do the poor have yet? - Prism volume calculation
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 16 cm and whose base is a right triangle with sides of 5 cm and 12 cm and a hypotenuse of 13 cm. - 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? - Pool pump calculation The pool for swimmers has dimensions of 25 m, 10 m, and 2.8 m, and the children's pool is only 10 m, 4 m, and 1 m. 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 chi
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