Maths practice for 11-year-olds. - page 142 of 222

Number of problems found: 4427

Two rectangles
I cut out two rectangles with 54 cm² and 90 cm². Their sides are expressed in whole centimeters. If I put these rectangles together, I get a rectangle with an area of 144 cm². What dimensions can this large rectangle have? Write all options. Explain your
Sandbox
Sandbox has an area of 32 sq ft and a length of 4 1/2 ft. What is the width of a sandbox?
Average 6717
How many kg of coal can fit in 1 m³? Note - 1 m³ (1000 liters) of brown coal walnut 2 weighs, on average, 720 kg.
Simplify 3
Simplify mixed numerals expression: 8 1/4- 3 2/5 - (2 1/3 - 1/4) Show your solution.
One-third 6704
What time is it now that the time that has elapsed since noon is one-third of the time before midnight?
Christmas napkins
The girls embroidered Christmas napkins. Each napkin had a triangle shape with 5 dm, 60 cm, and 800 mm sides. How many cms did the girls sew if they made 15 napkins?
Mean/average
Calculate the average of the numbers 2.3 4.01 0.65 6.
Hexagonal 6684
The drawer has five pairs of green and six pairs of blue gloves stored in a hexagonal way (without ice and storage). How many gloves do you have to blindly remove so that a pair of the same color is outside?
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.
Twenty-minute 6665
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?
Dimensions 6662
How many square meters of wallpaper do we need to glue the room walls with dimensions of 3 m and 4 m if the room's height is 2.5 m?
Cube edges
The sum of the lengths of the cube edges is 48 cm. Calculate the surface of the cube.
Circumference 6651
Calculate the circumference of a circle if its area is 706.5 cm²
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.
Equation: 6645
Solve the equation: (2v + 2) / 8 = (v-7) / 4-v
Equation: 6644
Solve the equation: 1/5. (a-3) -1/3. (a-5) = 1
The diagram
The diagram shows a cone radius of 8cm and a height of 10cm. How long is the diameter of the base?
Remaining 6638
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?
Curved surface area CSA
A cylinder 5cm high has a base radius(7/2) cm. Calculate the curved surface area.
Solve: 6632
For n ϵ N solve: 100 = (0.01n)²

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