Maths practice for 12-year-olds - page 167 of 347
Number of problems found: 6923
- Landing pad sand
How much sand is needed for a block-shaped landing pad with dimensions: Length 5.25 m, width 2.25 m, and the layer of sand should be 30 cm thick. How many times do we have to turn the cart if we load 0.75 m of sand on the cart? - Into box
How many cubes with an edge of 2.5 cm fit into a box measuring 11.6 cm, 8.9 cm, and 13.75 cm? - Light bulbs
You are in a room with 3 switches. In the next room, there are 3 switched-off classic light bulbs in table lamps; each switch belongs to one light bulb. You cannot see from one room to the other. How do you find out which switch belongs to which light bul - Leader captain selection
How many ways can a 6-member football club member choose a leader and captain from among themselves? - Competition placement options
How many ways could the four participants in the finals of the Pete, George, Martin, and Števo sports competition take the first three places? Write each option. - Trench soil
How many m³ of soil must be moved when digging a straight trench 170 m long, the cross-section of which is an isosceles trapezoid with bases of 150 cm and 80 cm, and arms are 90 cm long? - Parallelogram drawing exercise
Draw an ABCD brassier if a = 4.8 cm b = 3.5 cm and va = 2.9 cm - Nautical miles
How many nautical miles do they sail if the route is shown on a 1:25 000 scale map with a 7.4 cm long line? - Borrowing bicycle
Jacob lent a bicycle to friends who wanted to ride it. For a three-hour bike ride, Jacob received two chocolates. Yup. If you wanted a bike for 2 hours, you had to give Jacob 12 candies. Peter gave Jacob 1 chocolate and three candies. How long can Peter r - Temperature rise and fall
On Friday, the temperature was 82 °F. The temperature changed by –2 °F on Saturday, and then it changed by 5 °F on Sunday. What was the temperature on Sunday? How did the temperature change? Note that we consider the mathematical problem formulated in thi - Number division multiplication
Susan divided 256 by two by two and then multiplied the result by six by 2. What number did she get? - Cyclist meeting
From Děčín and Ústí nad Labem, which are 24 km apart, two cyclists rode against each other at the same time. One drove at an average speed of 28 km/h, and the other, which left Ústí, drove at a speed of 20 km/h. How long did the cyclists meet, and at what - From vacation
Táňa brought from vacation a bag full of seashells, but certainly not more than 300 of them. She wanted to give them to her friends, so she divided them into six equal piles. Then she remembered another friend, so she redistributed them into seven equal p - Candy remaining Eve has four types of candies. He has ten strawberries, and of every other kind, he has candies. How many candies would she have left if she ate two sweets of each type?
- Angle sum puzzle
Jerry had 4 angles written in his notebook, the sum of which was a right angle. The little sister rubberized one corner of it. Determine its size if the remaining angles remain written in the notebook: 12°34, 34°56, 56°9. - Barter exchange calculation
We can exchange three bananas for four oranges in a barter shop, and nine bananas are obtained for four pineapples. How many oranges do we get for one pineapple? - Cube volume comparison
We have two cubes of the same weight. One is all made of glass, the other of cork. Which one has more volume, and how many times? - Division remainder calculation
Find the number that, when divided by 28, gives the ratio 606 and the remainder 23. - Insulate house
The property owner wants to insulate his house. The house has these dimensions of 12, and 12 m is 15 m high. The windows have six dimensions, 170 and 150 cm. Entrance doors are 250 and 170 cm in size. How many square meters of polystyrene does he need? - Circle center construction
There is any circle k that does not have a marked center. Use a suitable construction to find the center of the circle k. Try on two different circles.
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