Maths practice for 12-year-olds - page 248 of 347
Number of problems found: 6923
- Cube edge
The edge of the cube has a length a = 1. Find the length of the edge of a cube that has a double surface. - The wall
The wall in the bathroom has dimensions of 2.8 m and 2.6 m. Suppose we would like to cover this wall to a height of 1.6 m. How many square meters of tiles do we need to buy? - Diamonds puzzle
The puzzle is composed of paper diamonds. One diamond (rhombus) has a diagonal 3.4 cm long and a corresponding height of 2.5 cm. How much paper in dm squared is needed for 60 diamonds? - Rhombus Parquet Room Area
The parquet floors in the room have the shape of a rhombus with a side of 2.5 dm long and a corresponding height of 0.8 dm long. How many square meters does a room have if its floor is made of 600 parquets? - Cube edge The cube has a surface area of 110.6 cm². Calculate the length of its edge.
- Kamil's Luggage
Kamil flew to South Africa. On the plane, luggage is limited to 20 kg. Kamil's suitcase weighs 5.6 kg, and the 20 T-shirts he packed each weighed 20 dag. He also packed 5 pairs of trousers at 800 g each and toiletries weighing 2,600,000 mg. Just before le - Clock hands
The second hand has a length of 1.5 cm. How long does the endpoint of this hand travel in one day? - Spruce planting
Mrs. Brown planted 50 spruce trees in three and a half hours in the morning. Mrs. Clark came in the afternoon, and together they planted another 100 spruce trees in four and a half hours. Find: A. How long would it take Mrs. Clark to plant 50 spruce trees - Rose Bushes Equilateral Triangle
The flower bed in front of the house is an equilateral triangle with a side length of 2.5 m. Mom plants roses around it. How many rose bushes does mom need to plant if she plants the bushes at the same distance of 50 cm from each other? - Speed increase
The tourist travels at an average speed of 3.5 km/h. The last train takes him 50 minutes. If he still has 5 km to go to the station, how much does he have to increase his speed? - Children age
The woman has two children, who will be 60 years old in four years. The children are the same age. How old are the children now? - Monthly plan
The production plant fulfilled 1/4 of the monthly plan in the first 10 days of the month, 5/14 in the second decade, and 3/7 of the monthly plan in the remaining part of the month. Determine if the monthly plan has been met. - Material improvement
Material in a factory was originally enough for two workshops for 20 days. After implementing an efficiency improvement, the same material lasted 25 days. How many days will the material last for 5 workshops now? How many extra days of work do the saved m - Train delay
The train should be at the station for 10 minutes. It still has 32 km left. What is the expected delay if the train travels in 2 minutes 3 km except for the last section, 2 km in 5 minutes? - Unknown number
If I reduced the sum of 70 and the unknown number three times, I would get 100. What is the unknown number? - Division with Remainder
What number did we divide by 55 if the ratio is 9.16 and the remainder is 0.04? - Trapezoid construction
Construct an isosceles trapezoid, whose base is 6 cm long, the base forms an angle of 30 ° with the diagonal, and the arms are 4 cm long. - Third pump
The first pump fills the pool in 12 hours. The second pump fills it in 15 hours. If all three pumps work, the pool will fill in 4 hours. How long will it take to fill the pool with only the third pump? - Thunder and lightning
There was a glimpse of the sky, and we heard thunder in 4.5 seconds. The light spreads at 300,000 kilometers per second, so we can assume the flash instantly without delay. However, the sound's speed is much lower in the air, one-third of a kilometer per - Czech flag
Calculate the areas of the colored parts on Czech flag in the shape of a rectangle with dimensions of 2 m and 1 m. White and red form half the width, the blue triangle is isosceles, and its apex is half the length.
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