Maths practice for 12-year-olds - page 103 of 355
Number of problems found: 7081
- 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? - Calculate cone - S,V
Calculate the surface and volume of a rotating cone, the base of which has a diameter of 6 cm and a height of 4 cm. - Square area increase
The area of the square is 36 cm². What will be the area of the square if we increase the length of a side by 25%? - Triangle base angle
An isosceles triangle has an angle of 78°20' at the base. Calculate the size of the angle between the arms. - The temperature 27
The temperature in Chicago was –12°C. For 4 hours, the temperature rose 3°C every hour. What was the temperature after 4 hours? - The temperature 26
The temperature on February 2 in Lake City was 14 F The temperature in Ellenville the same day was -6 F. how much warmer was it in Lake City than in Ellenville? - Triangle construction sides
Construct a right triangle ABC with the hypotenuse AB: a) | AB | = 72 mm, | BC | = 51 mm b) | AB | = 58 mm, | AC | = 42 mm - Dog food
The bag of dog food weighs 25 pounds. Each serving of dog food weighs 5 ounces. How many servings of dog food are in the bag? - Remaining side
Calculate the remaining side of the rectangle when you know the size of the perimeter and the length of one side. Perimeter o=38cm, and side a=12cm. - Cube weight edge
The cube with an edge of 1 cm weighs 0.2 kg. What is the weight of a cube made of the same material with an edge 4 cm long? - Prime number probability
We randomly draw one out of 18 cards with numbers from 1 to 18. What is the probability that the ticket drawn is a prime number? Write the result as a decimal number rounded to two decimal places. - Cyclist distance hours
The cyclist will ride 42.5 km in 2.5 hours. How many kilometers will he cover in 4 hours and 15 minutes?
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