Maths practice for 12-year-olds - page 103 of 355
Number of problems found: 7085
- Random event operations
Consider an experiment with a dice. Let us define the random events A={at most 3}, B={roll more than 1}, C={roll 2, 3, 4}. Determine the random event D that is given by the operations A∪B \ B∪C - Wire length needed
The wire measured 109.3 cm and was 0.327 m shorter than the pupils needed in the class. How long did the pupils need? - Square circle difference
A circle is inscribed in a square with a side of 12 cm so that it touches all its sides. Calculate the difference between the area of the square and the circle. - Cylinder cube water
We placed the largest possible lead cylinder in a 1-liter cube container. How many deciliters of water will now fit in the container? - Quadrilateral prism
Calculate the surface and volume of a quadrilateral prism if given: the area of the base is 40 cm square, the bottom of the base is k = 8 cm, and the height of the prism is 1.3 dm (the bottom is a rectangle) - Hexagonal prism volume
Calculate the volume and surface of a regular hexagonal prism with a height v = 2cm and a base edge a = 8cm. - Sandwiches
In a cafeteria, 1/6 of the students eat salads, and 2/3 eat sandwiches. There are 18 students in the cafeteria. How many students are eating lunches other than salads or sandwiches? - Mathew
Mathew has eight pencils. Three of them do not have erasers on end. What fraction of the pencils do not have erasers on end? - Natural number composition
Which natural number contains 12 thousand, 15 hundred, 21 tens, and 11 units? - Vase height volume
The cylindrical vase has a volume of 1 l. If its base has an area of 0.5 dm2, calculate its height. - For last
Last week, the temperature varied a total of 17 degrees over the day. If the high for the day was 10 degrees, what was the low for the day (write a number sentence and solve it. ) - Starter current flow
Determine the current flowing through the car's starter, whose resistance is 60 milliohms at 12V. - Handset voltage resistance
The handset has a resistance of 4000 ohms. Calculate what voltage is connected to them if the current passes 2.5mA. - Consecutive number middle
There are five consecutive natural numbers. If the middle number is subtracted from the sum of the other four, I get 21. Specify these numbers. - Class boy girl ratio
In the 9th grade, the ratio of boys to girls is 1:3. There are a total of 24 students in the class. How many boys and how many girls? - Danka Janka age
Danka and Janka are the same age. If one were ten times less and the other five times less, they would only have three years together. How old are Jana and Danka? - Cylinder volume diameter
Calculate the volume of a cylinder whose base has a diameter d = 22 cm and its height is 1.7 dm. - A tank
A tank is 7/9 full of water,1/5 of the tank is drawn in the morning, and 1/3 is drawn in the evening. What fraction of water is still in the tank? - Bucket plastic material
The plastic bucket has the shape of a cylinder with a diameter of 25 cm and a height of 40 cm. How many square centimeters are needed to produce it? How many liters does it contain when filled 5 cm below the rim? - Chocolate - comparing
Robert has 8.2 cm, 3.1 cm, and 0.8 cm long chocolate. Norbert has 0.4 cm, 5 cm and 7.9 cm chocolate. Which one has more chocolate, and how much?
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