Maths practice for 12-year-olds - page 168 of 351
Number of problems found: 7018
- Barter exchange calculation
We can exchange three bananas for four oranges in a barter shop, and nine bananas are obtained for four pineapples. How many oranges do we get for one pineapple? - Cube volume comparison
We have two cubes of the same weight. One is all made of glass, the other of cork. Which one has more volume, and how many times? - Division remainder calculation
Find the number that, when divided by 28, gives the ratio 606 and the remainder 23. - Insulate house
The property owner wants to insulate his house. The house has these dimensions of 12, and 12 m is 15 m high. The windows have six dimensions, 170 and 150 cm. Entrance doors are 250 and 170 cm in size. How many square meters of polystyrene does he need? - Circle center construction
There is any circle k that does not have a marked center. Use a suitable construction to find the center of the circle k. Try on two different circles. - Barrel keg filling
Behind the house stands a barrel with 0.25 hectoliters of water. The father gradually takes 12 liters of fragile water from it for watering until the last 10 liters of water remain at the bottom. At most, how many full kegs could the father fill from this - Nautical mile calculation
Hansel will go on vacation with his parents and go by boat for a certain part of the journey. He is interested in how many nautical miles they will sail if their route represents by a line 7.4 cm long on a 1:25,000 scale map. (1 nautical mile = 1,850 m) - Insert AP member
Insert arithmetic means between 75 and 180. - Find the mean Find the number between 13 and 29.
- Two xeroxes
The performances of the two copiers are in the ratio of 3:4. A machine with higher power will make 7,200 copies in one hour. How many copies will both machines make together in 5 hours? - Diamond area comparison
Which diamond with a side length of 7.5 cm has: a / largest area, b / smallest area - Six-tonne truck
The platform of a six-tonne truck is 2.20 m wide and 4.20 m long; the side panels are 0.75 m high. How many cubic metres of gravel could be loaded onto the truck with the load levelled to the top of the side panels? How deep a layer of gravel can be loade - Roof repair
To repair the roof, we need 15 pieces of boards 6 m long, 15 cm wide, and 25 mm thick. If 1 m³ of boards costs 500 euros, how many euros will we pay for all the boards? - Jelly sugar ratio
Did Sonia not like the ratio indicated on the jelly sugar; which picture is wrong and why? A) for 1000 g of fruit, add 350 g of sugar 3:1: super jelly sugar B) 3:1 for 1500 g of fruit, add 500 g of sugar: extra jelly sugar - Ice volume calculation
What is the volume of 320 kg of ice floes in liters? - Number sixth puzzle
If we subtract its sixth from the number's triple number, we get half of that number increased by 28. What is the number? - Triangle bar division
How many identical triangles do the middle bars divide the triangle ▲? - Imaginary number puzzle
Half of the imaginary number reduced by a quarter of the same number equals one-third of the largest two-digit number. What did the number mean? - Divisible by nine How many three-digit natural numbers in total are divisible without a remainder by the number 9?
- Board paint calculation
Štěpán painted a block-shaped steel board measuring 2.2 m, 1.5 m, and 1.6 m twice with a protective coating. How many kilograms of paint would he consume if he used 120 g of paint per 1 m²?
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