Maths practice for 11-year-olds. - page 220 of 221

Number of problems found: 4414

Father and son
A father and son are 74 years old together. The son is 30 years younger than the father. How old is the son?
Trio
58 children lined up in groups of three. How many children did not create a trio?
Addition of Roman numbers
Add the following and write the result as a decimal number: LXXV + MCCCXV
Quiz
The tested student answered correctly on a 3/6 question. The wrong answer was 16. How many questions were answered?
Trapezium zoom
By how many times does the area of a trapezoid increase if all its sides and height are multiplied by 5?
Sumo competition
In a heaviest-man competition there were 5 competitors. The top three together weighed 369 kg. What is the minimum possible weight of the winner, given that contestants' weights are measured to the nearest kilogram?
Rectangles
Calculate how many rectangles of size 1 × 4 cm can be cut from a sheet of paper measuring 60 cm × 13 cm.
Rectangle A2dim
Calculate the missing side of a rectangle whose area is 950 m² and one side is 38 m long.
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
Isosceles trapezoid ADMR (AD ∥ MR) has an angle of 30° at vertex A. Calculate the size of the angle at vertex M.
Garden
A trapezoid-shaped garden has parallel sides of 19 m and 24 m. Its area is 193.5 square metres. What is the height of the trapezoid?
Area of trapezoid
The parallel sides of a trapezoid are 9 dm and 7 dm. Its height is 3 cm. Calculate the area of the trapezoid.
Rectangular trapezoid
How many interior right angles does a right-angled trapezoid have?
Present
A gift box has the shape of a cuboid with dimensions 8 × 8 × 3 cm. Miloslav wants to wrap it using square sheets of paper with sides of 18 cm. How much paper is left over?
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 cuboid with a square base. It contains 62 litres of water and the base edge is 34 cm long. To what height does the water level rise?
Shape
A plane figure has a maximum area of 677 mm². Calculate its perimeter if the perimeter is to be as small as possible.
Maximum area of rhombus
At what interior angles does a rhombus have the maximum area?
Pension or fraud
Imagine working your entire career honestly, paying taxes and social insurance contributions (in Slovakia). You have a gross wage of 970 euros. You and your employer together pay 310 euros per month in social insurance contributions over 41 years, and you

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