Maths practice for 12-year-olds - page 343 of 347
Number of problems found: 6923
- Rotating cone
Calculate the volume of a rotating cone with base radius r=18 cm and height h=20 cm. - Is right?
Is a triangle with sides 15, 66, and 68 a right triangle? - Average
The average of 5 numbers is 108. What is their sum? - Rectangles
How many rectangles with an area of 8855 cm² have sides that are natural numbers? - Minute angle
Find the angle swept by the minute hand of a clock in 30 minutes. - Guess number
With what number should be divided, number 10387 to be reduced by 30%? - Secret number
Find the secret number n, which reversed decreases by 15.4 if the number increases by 15.4. - Clock
How far does the tip of a clock's second hand travel in day, if the second hand is 15 mm long? - Earth parallel
The Earth's radius is 6377 km. Calculate the circumference of the parallel at latitude 75°. - Tree trunk
Calculate the average diameter of a tree trunk whose circumference is 192 cm. - Train
A train travels a section of line in 55 minutes at a speed of 70 km/h. At what speed would it need to travel to shorten the journey time by 16 minutes? - Seedcake
Seedcake costs 20 cents. How many minimum seedcakes must we buy that we can pay in cash, only whole euros? - Equilateral triangle
Calculate the side length of an equilateral triangle whose area is 886 mm². - Circle
What is the area of a circle whose circumference is 51.2 cm? - Truncated cone
Calculate the volume of a truncated cone with base radiuses r1=19 cm, r2 = 11 cm, and height v = 5 cm. - DIY press
Under the socialist regime, in some socialist countries, owning a typewriter required special permission. That has hindered the spread of DIY literature (manually transcribed through carbon copy paper for typewriters). Calculate how many typewriters today - Copper sheet
The copper plate has a length of 2.2 m, width 92 cm, and weighs 5.6 kg. What is the plate thickness if 1 m³ weighs 8732 kg? - Cylinder
Calculate the dimensions of a cylindrical container with a volume of 10 litres if its height equals its base diameter. - Car range
Kia has an average diesel consumption of 5.2 liters per 100 kilometers. What is the range of the car for 138 euros if fuel costs 1.3 EUR/liter, if the tank has a volume of 64 liters? - Forest nursery
In a forest nursery, one borovice is planted per 2 m². Calculate how many plants are planted on an area of 510 hectares.
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