Maths practice for 12-year-olds - page 295 of 362
Number of problems found: 7227
- Loading car
The car was loaded with 78 boxes weighing 19 kg. If the total weight is the same, how many 25kg boxes can it load? - Distance 3295
If the train travels at an average speed of 60 km/h, it will cover a certain distance in 5 hours and 30 minutes. What is the average speed he travels to cover the same distance in 5 hours? - The chef
The chef has to prepare 60 hundred-gram portions of roasted pork. Since 1 kg of raw meat loses 150 grams by baking, how many kilograms of meat does he have to start roasting? - Calculate 3292
The perimeter of the isosceles triangle is 32 cm. The base is 2 cm longer than the shoulder. Calculate the sides of the triangle. - Workers 3291
The broad workers will do the job in 22.5 days. How many workers still need to be hired to do the job seven days earlier? - Rectangle 3290
The rectangle 1 m and 40 cm long and 1 m and 20 cm wide is paved with square tiles with a side of 1 dm. There is one row of brown tiles on all edges of the rectangle, white on the inside. How many brown and how many white tiles? - Originally 3289
The pullover originally cost 45 euros. First, it fell by 20% and then by 10%. What is its current price?
- Candies
The price for 1 kg of more expensive candies is 125 CZK. The price for 1 kg of cheaper candy is 100 CZK. We mix two different mixtures of candy. A) The first mixture contains 2 kg more expensive and 0.5 kg cheaper candy. Calculate the price for 1 kg of th - Adolescents 3286
The rowing club has 90 members. Four times as many older adolescents are in the section as younger adolescents. On the other hand, 54 fewer younger adolescents are in the section than older adolescents. How many older and younger adolescents are there? - Magic number
The number 135 split into two addends so that one addend was 30 greater than 2/5 the addend. - Together 3281
My father said: I am 40 years old. One son is 16 years old, and the other is three years old. How many years will my sons be together as I am now? - One-sixth 3279
If I had half as many nuts as I have now, I would have the same as Vendulka. If Vendulka had a third less than she has now, she would have the same size as me. If she had one-sixth less than she has and gave me that part, we would have the same amount. Ho - Determine 3274
Nine cleaners clean 3150 m² of the floor in 7 days. Determine how many m² of floor eight cleaners will clean in 9 days. - Unknown number
Find the unknown number equal to a quarter of a fifth of a number, which is 152 more than an unknown number. - Quadrilateral 3262
Construct a quadrilateral ABCD with dimensions AB, BC, AC, BD, and angle d = CDA.
- Engine pulley
The engine has a 1460 rev/min (RPM). The disc diameter is 350 mm. What will be the peripheral disc speed in RPM? Pulleys on the engine have a diameter of 80mm, and a disc has a diameter of 160mm. - Kilometers 3259
The deadhead fox butterfly flies at a speed of 50 km/h. They will move to us from Africa in 3 and 3/4 days. How many kilometers will he fly on this journey? - Cylinder twice
If the radius of the cylinder increases twice, and the height is reduced twice, then the volume of the cylinder increases (how many times?): - Tank full
Two hl of water were poured into a block-shaped tank with dimensions of 450 mm and 600 mm and a height of 900 mm. How many liters of water need to be added to keep the tank full? - Prism
Calculate the surface area and volume of a prism with a body height h = 10 cm, and its base has the shape of a rhomboid with sides a = 5.8 cm, b = 3 cm, and the distance of its two longer sides is w = 2.4 cm.
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