Maths practice for 11-year-olds. - page 223 of 224

Number of problems found: 4470

Trapezium zoom
How many times should the area of the trapezoid be increased if all sides and altitudes increase 5 times?
Sumo competition
In the competition for the heaviest man was 5 competitors. The first three together weighed 369 kg. What is the minimal weight of the winner if a contestant weighed with an accuracy of one kilogram?
Rectangles
Calculate how many squares/rectangles of size 1×4 cm we can cut from a sheet of paper of 60 cm×13 cm.
Rectangle A2dim
Calculate the side of the rectangle if you know that its area is 950 m² and one side is 38 m.
Collective irresponsibility
On the Internet, time is very uncomfortable for the state that no more gaffes or waste is no longer possible to hush up as if people were at home with only two television channels censored. An example of the effectiveness of the state can be Bridge at Kom
Isosceles trapezium
Trapezoid ADMR (AD||MR) is isosceles. The size of the angle at vertex A is 30 degrees. Calculate the size of the angle at vertex M.
Garden
Trapezoid garden has parallel sides 19 m and 24 m. Its area is 193.5 square meters. What is the width of the garden?
Area of trapezoid
The trapezoid bases are 9 dm and 7 dm. Its height is 3 cm. Calculate the area of the trapezoid.
Rectangular trapezoid
How many inner right angles have a rectangular trapezoid?
Present
The gift box has a rectangular shape with dimensions of 8×8×3 cm. Miloslav wants to cover it with square paper with sides of 18 cm. How much paper was left to him?
Monkey
The monkey fell into 20 meters deep well. Every day it climbs 3 meters, at night it drops back by 2 m. On what day it gets out from the well?
Circles
For the circle c₁(S₁; r₁=109 cm) and c₂(S₂; r₂ = 152 cm) is distance of centers |S₁S₂| = 261 cm. Determine the distance between the circles.
Aquarium
An aquarium is a rectangular box with a square base containing 62 liters of water. The length of the base edge is 34 cm. To what height does the water level rise?
Shape
The plane shape has a maximum area 677 mm². Calculate its perimeter if the perimeter is the smallest possible.
Maximum area of rhombus
Calculate the interior angles at which the equilateral rhombus has a maximum area.
Pension or fraud
Imagine your entire working life working honestly and paying taxes and Social Insurance (in Slovakia). You have a gross wage 970 Euros. You pay social insurance (you and your employer) monthly € 310 during 41 years, and your retirement is 446 Eur dur
Rhombus angles
If one angle in the rhombus is 137.6°, what is its neighboring angle in the rhombus?
Rhombus HP
Calculate the area of the rhombus with height 48 cm and perimeter 64 cm.
Rhombus problem
The perimeter of the rhombus is 268 m, and its area is 2278 m². Calculate the height of the rhombus.
Playground
The rectangular playground is fenced with 38 m long netting. Its width is 7 m. Calculate its length.

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