Maths practice for 12-year-olds - page 188 of 350
Number of problems found: 6986
- Block-shaped 17543
The block-shaped reservoir has 147 hl of water and is 3.5 m long and 2.8 m wide. Calculate its height. - Circumference 17533
If we enlarge the side of the square by half, its circumference will be 24 cm larger than the original. What is the side of the square? - Negative and postcard
The image on the negative has dimensions of 36x24 mm and is enlarged to a postcard format of 13.5x9 cm. In what proportion have the lengths increased? In what proportion has the image area increased? - One-quarter 17483
The cloth package was stained black: one-third and one-quarter black, the remaining 8 meters gray. How many meters of cloth was in the box? - Calculate 17473
Calculate the length of the oval race track, which has two straights of 100 m, and the diameter of the curves is 52 m. - The length
The length of the circle is 24 cm. What is the circular arc length of the corresponding angle of 30°? - People 17333
The room is 240 cm high and has a volume of 48 m³. How many people can work in it when there is 7 m² of floor space per person? - Subsequent 17323
Four people were paid bonuses, so each subsequent person received half as much as the previous one. How much did everyone receive if the company paid out a total of CZK 6,500? - Weighing 17273
A body weighing 2 kg with a 7.8 g / cm³ density is placed in water. Does the body sink? Will he swim (1 = Yes, 0 = No)? - Block-shaped 17203
A block-shaped pool with bottom dimensions of 12 m and 20 m and a depth of 2 m is filled with two pipes. The first pipe flows 6 l of water per second, the second 2.4 hl per minute. How many hours and minutes will the pool be filled 40 cm below the edge? - Metal barrel
A barrel for transporting fuel has a height of 90 cm and a radius of the base of 30 cm. How many square meters of sheet metal are needed to make a barrel? - Flowerbed 17183
Six pupils will adjust the flower beds on the school grounds in 2 hours. In how many hours will four pupils change the same flowerbed? - Juice-soaked glass
1. Find the dimensions of a 5-liter cylindrical container if the height of the container is equal to the radius of the base. 2. There are three dl of juice in a cylindrical glass with an inner diameter of 8 cm. Calculate the area of the juice-soaked por - Parallelogram-shaped 17123
How wide is the parallelogram-shaped garden when its area is 1378 m2, and its longer side measures 53 m? - Double-digit 17103
If we can repeat the digits in a number, how many double-digit numbers can we create from the digits 1, 2, 3, 4, 5, and 6? - Smaller 17093
There are two gears in the wall clock. The larger wheel has 54 teeth, and the smaller one has 24 teeth. How many times does the small wheel turn if the big one turns four times? - Summands 17033
Express the number 274 in the form of the sum of three summands so that the first summand is 16 smaller than the second summand and the third summand is six larger than the first summand. - Perpendiculars 17003
What is the hole volume drilled by the drill in the shape of a right triangle that revolves around a longer perpendicular? The perpendiculars of the triangle are 10 cm and 3 cm long. - November 16963
Zuzana receives pocket money from her parents. In October and November, she managed to save 288 euros. The ratio of money saved for October and November is 5:4. How many euros did Zuzana save in October, and how much in November? - Circumference 16933
In the diamond ABCD, the angle BAD is 60°; the length of the diagonal BD is 7 cm. Calculate the circumference of the diamond.
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