Maths practice for 12-year-olds - page 105 of 353
Number of problems found: 7043
- Handset voltage resistance
The handset has a resistance of 4000 ohms. Calculate what voltage is connected to them if the current passes 2.5 mA. - 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
Dana and Jane are the same age. If one's age were divided by ten and the other's by five, their ages would add up to three years. How old are Jane and Dana? - 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. In the morning, 1/5 of the tank's contents is drawn, and in the evening, 1/3 of the tank's contents is drawn. What fraction of the tank still contains water? - 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. Over 4 hours, the temperature rose by 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=38 cm, and side a=12 cm. - 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? - Kuba four-digit number
Jake wrote down a four-digit number containing two even digits and two odd digits. If he crossed out both even digits, he would get a number four times smaller than if he crossed out both odd digits. What is the largest number with these characteristics t
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