Maths practice for 12-year-olds - page 42 of 350
Number of problems found: 6992
- Meat 5
2.4 kg of meat costs 292 CZK in the store. How much meat of the same type can I buy here for 2482 CZK? - Path 11
A path 1.5 meters wide is to be built around the perimeter of a square plot of land with a side of 28 meters. By how much will the area of the plot be reduced? - Solve R
Solve the equation with brackets: 5×(2u-9)-8×(0.5-3u)=4×(7u-1)-3 - Quarter of some number
A quarter of an unknown number increased by one hundred is fifty. What is the unknown number? - Triangle ABP
An isosceles trapezoid ABCD is given. The length of side AB is 10 cm, the length of CD is 7 cm, and the height to side AB is 4 cm. Point P is the base of the altitude to side AD. Calculate the area of the triangle ABP. - Salad - delicacy
The customer paid € 1.50 for 300g of salad. How much € will he pay for 500 g of salad? - Measuring cylinder
A measuring cylinder has a base radius of 35mm and a height of 500mm. Calculate the surface area wetted by the liquid if the level reaches a height of 35cm. - Calculate 423
Calculate the volume and surface area of a cylinder if its height is 40 dm and the diameter of the base is 3 m. - A fraction of an hour
Calculate in minutes: 2/3 of 5 hours. - In the kitchen 2
In a kitchen measuring three by two meters, we want to lay square tiles with sides of 20 cm on the floor. If there are exactly 40 tiles in one package, how many such packages do we need to buy to cover the entire kitchen? (We place the tiles right next to - Running race
The running race consists of two stages. Two-thirds of the competitors completed the first stage, and only three-quarters of them completed the second stage. Only 12 competitors reached the finish line. Determine how many competitors were at the start and - Trainers 3
Trainers start in six steps, eight steps, nine steps, and ten steps. Each time they have one trainee left. How many trainees were there? - From a full
From a full cylindrical glass with a diameter of 8 cm, we poured 1 deciliter of water. By how many centimeters did the water level in the glass drop? - Boxes
Boxes in the shape of a cuboid/without a lid/we decided to paint all sides/both inside and outside. The dimensions of the bottom are 60 cm X 30 cm and the height is 12 cm. How many cans of paint will be needed to paint 10 such boxes if one can last for pa - Storm 4
Approximately 4000 trees grow on 1 hectare of forest. During the storm of 20.11.2004, 95% of the trees on 100km² of the forest cover of the High Tatras were destroyed. How many trees were destroyed? - Asphalt - road
2933 kg of asphalt is how many m³? Use the density of asphalt as 2400 kg/m³. Help: Natural asphalt (bitumen): 1.01 – 1.05 g/cm³ (1010 – 1050 kg/m³) Asphalt mixture (for roads): 2.2 – 2.5 g/cm³ (2200 – 2500 kg/m³) Contains mineral aggregates, so it is dens - Into the bottle
The bottle can hold water weighing no more than 1 kg. Can you pour gasoline weighing the same amount into this bottle? - Calculate 263
Calculate the area of a rhombus whose diagonals are u=12, v=19 - Bathroom 3 The bathroom measures 300x210 cm. What are the largest square tiles and how many will I need to cover the floor?
- Reward - division
Mom promised the children a reward of 330 euros for their help. How should they divide the money if Juraj helped for 10 days, Ema for 8 days, and Hanka for 12 days?
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