Maths practice for 12-year-olds - page 239 of 347

Number of problems found: 6923

Time Puzzle Midnight
A pedestrian met Street Math and asked him what time it was. "Add half the time to midnight to a quarter of the time, and you'll get the exact time." What time was it?
Cyclist and Motorcyclist Time
The cyclist covered a certain distance in 6 hours and 15 minutes. How long will it take for a motorcyclist to travel five times more if he travels three times faster?
Quadrilateral surface area
Calculate in dm² the surface of a quad whose edges have 1.2 dm, 1.4 dm, and 2 dm.
Twenty
Twenty rabbits are put in 4 cells so that there are a different number of rabbits in each cell containing at least three rabbits. What is the largest possible number of rabbits in one cell?
Dropped sheets
Three consecutive sheets dropped from the book. The sum of the numbers on the pages of the dropped sheets is 273. What number has the last page of the dropped sheets?
Pyramid Height Volume Area
What is the tent's height in the shape of a regular quadrilateral pyramid, whose volume is three dm³ and the base has an area of 6 dm²?
Average Speed for Distance
At what average speed does a car have to travel to drive 55 km in exactly half an hour?
Drawing Gym to Scale
The gym at the school is 12 m wide and 1800 cm long. Draw it on a scale of 1:500
Strawberry Jam Sugar
Friends Marika and Kate decided to prepare strawberry jam together according to the recipe. They needed 50 g of sugar for 0.5 kg of fruit. How many kilograms of sugar must the friends prepare if they make jam from 2.3 kg of strawberries?
Calculate
Calculate the area cm² diamond with a side length of 9.8 cm and a height on the side of 5 cm.
Two Numbers Ratio Larger
The ratio of the two natural numbers is 2:3. The smaller natural number from this pair is 12. Calculate the larger.
The well
The well has the shape of a cylinder with a diameter of 2 m. From ground level to water level are 4 meters, and the water depth in the well is 6 m. How many m³ of soil did they dig when digging a well? How many liters of water are in the well?
How much
How much money will we pay for 20 planks 4m long, 15cm wide, and 26mm thick when 1m³ of wood costs 4500kč?
Pyramid Surface Area Ratio
The area of a regular quadrilateral pyramid's mantle is equal to twice its base's area. Calculate the pyramid's surface if the length of the base edge is 20 dm.
Pool tiles
The pool is 25 m long, 10 m wide, and 160 cm deep. How many m² of tiles will be needed on the walls and the bottom of the pool? How many tiles are needed when one tile has a square shape with a 20 cm side? How much does it cost when 1 m² of tiles costs 25
Rhombus 29
One of the diagonals of a rhombus is equal to a side of the rhombus. Find the angles of the rhombus.
Exercise creation
Three lecturers will create 75 tasks in two and a half days. In how many days will it take at least five lecturers to create enough exercises for the exercise book, which should contain 300 exercises? (we assume that all tutors are equally efficient and w
Map scale
The rectangular plot has a scale of 1:10000 and an area of 3 cm² on the map. What area does this plot have on a 1:5000 scale map?
Painters
Six of the painters paint 90 m of the fence in five hours. For how long would the four painters paint a 45-meter fence? How many meters of the fence were painted by painters 5 for two hours?
Hotel Rooms Count Triples
There are a total of 110 beds in the hotel, which are available in single, double, and triple rooms, while there are three times more triple rooms than single rooms and twice as many double rooms as triple rooms. How many triple rooms are there in total i

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