Maths practice for 12-year-olds - page 164 of 355
Number of problems found: 7085
- Competition placement options
How many ways could the four participants in the finals of the Peťo, Juro, 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 = 4.8cm b = 3.5cm and va = 2.9cm - 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
Jakub lent a bicycle to friends who wanted to ride it. For a three-hour bike ride, Jakub received two chocolates. Yup. If you wanted a bike for 2 hours, you had to give Jakub 12 candies. Peter gave Jakub 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 this w - 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 - Candy remaining Eva 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
Jaro 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? - 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. - Barrel keg filling
Behind the house stands a barrel with 0.25 hectoliters of water. The father gradually takes 12 liters of fragile water from it for watering until the last 10 liters of water remain at the bottom. At most, how many full kegs could the father fill from this - Nautical mile calculation
Jeníček will go on vacation with his parents and go by boat for a certain part of the journey. He is interested in how many nautical miles they will sail if their route represents by a line 7.4 cm long on a 1:25,000 scale map. (1 nautical mile = 1,850 m) - Insert AP member
Insert arithmetic means between 75 and 180. - Find the mean Find the number between 13 and 29.
- Two xeroxes
The performances of the two copiers are in the ratio of 3:4. A machine with higher power will make 7,200 copies in one hour. How many copies will both machines make together in 5 hours? - Diamond area comparison
Which diamond with a side length of 7.5 cm has: a / largest area, b / smallest area
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