Maths practice for 12-year-olds - page 229 of 347
Number of problems found: 6932
- Sand path
How much m³ of sand is needed to fill the 1.5 m wide path around a rectangular flowerbed of 8 m and 14 m if the sand layer is 6 cm high? - Regular prism
The regular four-sided prism has a base of 25 cm² and a surface of 210 cm². Find its volume. - Interior angles
You know the size of the two interior angles of the triangle alpha = 40° and beta = 60°. Calculate the size of the third interior angle. - Truck Journey Time
The truck driver left Prague at 7:20 a.m., took a twenty-minute break in Poděbrady, and reached Hradec Kralové at 8:55 a.m. How long did the whole journey take (including a break)? How long was the ride itself? - Wallpaper for Room Walls
How many square metres of wallpaper are needed to cover the walls of a room measuring 3 m × 4 m with a height of 2.5 m? - Cube edges
The sum of the lengths of the cube edges is 48 cm. Calculate the surface of the cube. - Circle circumference
Calculate the circumference of a circle if its area is 706.5 cm² - Filling a Swimming Pool
How long will the swimming pool be 20 m long, 12 m wide, and 2 m deep? Two inlets are used for filling, each filling nine hectoliters of water per minute. - Two angles
The triangles ABC and A'B'C 'are similar. In the ABC triangle, the two angles are 25° and 65°. Explain why in the triangle A'B'C 'is the sum of two angles of 90 degrees. - The diagram
The diagram shows a cone radius of 8cm and a height of 10cm. How long is the diameter of the base? - Farm Land Crops Area
The farm (ZD) grows corn on a third of its land, barley on a quarter, half of the remaining acreage is planted with clover, and the last 9 ha is reserved for growing cabbage. What is the size of the farm? - At the butcher's
The cold storage room at the butcher's has dimensions 4x3 m, a height of 2.5 m, and a door measuring 90x200 cm. The walls will be tiled up to the ceiling, but before that they need to be treated with two layers of primer and one layer of anti-mould coatin - Curved surface area CSA
A cylinder 5 cm high has a base radius(7/2) cm. Calculate the curved surface area. - Solve Exponential Equation
For n ϵ N solve: 100 = (0.01n)² - Wooden Prisms for Cubes
In the toy factory, they produce dice in the shape of cubes with an edge of 3 cm from wooden prisms with dimensions of 3 cm, 3 cm, and 3 m. How many prisms do they need to make 1000 cubes? - Girls to Students Ratio
There are 26 pupils in the 7th grade, of which 10 are girls. Write down the ratio of the number of girls to the number of students. Simplify this ratio so that the numbers are as small as possible. - Ice Cube Edge Length
The ice cube weighs 24g. Determine the size of its edge to the nearest millimeter. If the ice density is 917kg/m3 - Triangle Height Calculation
Calculate the height on the d side of the BCD triangles: d = 0.4 m and S = 10.04 dm2 - Prism volume
A = 3 cm b = 4 cm prism height h = 10 cm Calculate the volume of a triangular prism with the base of a right triangle - the perpendicular a, b. - Simplify 2
Simplify expression: 5ab-7+3ba-9
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