Maths practice for 12-year-olds - page 142 of 353
Number of problems found: 7041
- Fire fighting
The cuboid-shaped fire fighting tank is 6 m long and twice as wide. What is the height of the tank if the firefighters fill the empty tank in 0.5 hours with a hose flow rate of 12 liters per second? - Tank water
Forty-eight liters of water are now in the vertical cylinder-shaped water tank. The water reaches a height of 27 cm. After an all-day downpour, water reaches a height of 72 cm. How much water will there be in the tank? - Balthazar step length
Balthazar walked ten steps 7.4 meters. How long is Baltazar? - Evaluate expression
Evaluate the following expression: 5² − (4 × 4) ÷ 2 = - Photo height proportion
While photographing the class, Henry noticed that he was only 8 cm tall in the photo, while Patrick standing next to him was 8.5 cm tall. Based on his height, Henry calculated that Patrick must measure 17 dm. How tall is Henry? - 540 pupils
Five hundred forty pupils enrolled in the school group, which is a fifth more than the group's capacity. How many pupils is the capacity of the group? - Garden snow volume
A 25 cm high layer of snow fell on the garden 110 m long and 60 m wide. How many m³ of snow fell? Draw a picture. - Electric wire
William has a piece of wire that measures 1 yard long. He will use wire to fix several electrical outlets in his house. How many inches long is the wire? Solve this problem using bar diagrams. - Main/central vertex
ABC is an isosceles triangle with base BC and central vertex A. The angle at vertex A is 18°. What will be the size of the angle at vertex B? - Shortcut
The road from the cottage to the shop 6 km away leads either along a straight road that the bicycle can drive at a speed of 18 km/h or by "shortcut". It measures only 3.6 km. But the road from the cottage is all uphill - at a speed of 8 km/h, you can go h - Garden fence mesh
My grandfather made a fence around his rectangular garden measuring 7.2 meters and 12 meters. How many meters of mesh did he have to buy, and how much did he pay if one meter of mesh was € 5.90? - Row for lunch
There are less than 66 people in a row for lunch. In front of Eve, there are 28 students. Behind Martin, there are 30 people. Between Eve and Martin, there are 17 people. How many students would stand behind Eve if Martin stood in front of Eve? - Consecutive odd sum
The sum of three consecutive odd numbers is 183. What is the largest of them? - Simplify:
Simplify: 8(−9 − 5x) + 4b use x = 9 and b = −9 - Consecutive odd numbers
The sum of two consecutive odd numbers is 184. What are these numbers? - Tank filling height
62.8 hl of water per hour flows through the pipe into an empty cylindrical tank with a bottom diameter of 8 m. In 4 hours, the tank will be filled to what height? - Mr. Gardener
Mr. Gardener wants to make wood for the balcony. Boxes. Each will have the shape of a perpendicular prism with a square base. The height is limited to 60 cm. He will fill each container with soil by pouring the whole bag of substrate sold into a package c - Potato harvest yield
Peter planted 220 kilograms of seed potatoes and harvested twelve times as much. One-sixth of the harvest was set aside for next year. How many tons of potatoes were left for eating? - Seconds flying
The hot air balloon flew for 8 hours, 8 minutes, and 8 seconds. How many seconds did it take to fly 10 hours? - Pipeline length
The new water supply pipeline is to be 1.2 km long. Employees put it from both ends. On one side, 0.492 km of pipeline is laid, and on the other side, 53,500 cm of a pipeline. How many meters of pipe are left to lay?
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