Maths practice for 12-year-olds - page 157 of 350
Number of problems found: 6985
- Cube containers
Replace the two cube-shaped containers with 0.8 dm and 0.6 dm edges with a single cube-shaped one to have the same volume as the original ones. What is the length of the edge of this cube? - Cross-section 35233
How much soil is needed to dig a 200m long ditch, the cross-section of which is a square with an area of 4812.5 cm2 - Transported 35203
The zombie column, which is shaped like a cylinder in the square, is 8 m high and has a diameter of 70 cm. I need to find out its weight. It will be transported by a truck with a load capacity of 8 tons. - Water-wetted 35193
The block-shaped pool with dimensions of 25 m and 12.5 m and a depth of 2 m is filled with 4/5 of water. Calculate the area of water-wetted areas. - Perpendicular 35183
Calculate the surface and volume of a vertical prism if its height h = 18 cm and if the base is an equilateral triangle with side length a = 7.5 cm. - A bus
A bus is scheduled to travel a distance of 121 km in 2 3/4 hours. What must the average rate of speed be maintained to arrive on schedule? - Line segment
Line segment AB is 8 cm long. Divide it by a ratio of 2:3. - The temperature 10
The temperature in a freezer is -15°C, which increases by 3°C. - Quadrilateral 35053
Calculate the volume of a regular quadrilateral pyramid, the base edge of which measures 6 cm and the height 10 cm - The cube
The cube has a surface of 600 cm². What is its volume? - Three-day 34971
During the three-day journey, the friends took 3/10 of the planned route on the first day and 1/4 of the intended way on the second day. How many km do they have left for the last day if the road is 80 km long? - Students 34961
Pupils paid 6 b for a total of CZK 1,000 for a school trip. They paid a total of CZK 230 for the train and another CZK 35 for lunch. How many students were on the trip? - Quarter of an hour
If the clock showed a quarter of an hour more, it would be 10 minutes to 10 hours. How many hours do they show? - 45194840364737364738 34871
The speed of the car is 23.45194840364737364738 km/h. How many hours will it take to travel around the world? - Calculate expr
Calculate the example with decimal numbers: -5 + (- 14 + 11) • [24-2 • (-0,4)] - {- 28-41 • [-8 • 2 + 4 • 1 • (0,1-2,4)] + 1} = - Three-fifths 34771
Calculate three-fifths of the ratio of the product and the sum of all prime divisors of 240. - Geometric 34741
What geometric shape do all points in the plane have the same distance from a given point in the plane? - Parentheses: 34731 Evaluate the expression with parentheses: 12 • (-4,3) + 3 • [14- (23-4 • 5)] - 2 • {36- [18- (28-76)]} =
- An airplane
An airplane flies 1440 km in 2 1/4 hours. What is its average speed in km per hour? - Individual 34661
The fence is built of 25 poles. The distance between the bars is 150cm. What will be the distance between the individual poles if we make a fence of 19 poles of the same length?
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