Maths practice for 12-year-olds - page 44 of 347
Number of problems found: 6932
- Quarter of some number
A quarter of an unknown number, increased by one hundred, equals 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 drawn to side AB is 4 cm. Point P is the foot of the altitude from A to side AD. Calculate the area of triangle ABP. - Salad - delicacy
A customer paid €1.50 for 300 g of salad. How much will they pay for 500 g of the same salad? - Measuring cylinder
A measuring cylinder has a base radius of 35 mm and a height of 500 mm. Calculate the wetted surface area if the liquid level reaches a height of 35 cm. - Calculate 423
Calculate the volume and surface area of a cylinder with a height of 40 dm and a base diameter of 3 m. - A fraction of an hour
Calculate in minutes: 2/3 of 5 hours. - In the kitchen 2
In a kitchen measuring 3 m × 2 m, we want to lay square tiles with sides of 20 cm on the floor, placed right next to each other. If there are exactly 40 tiles in one package, how many packages do we need to buy to cover the entire kitchen? - Running race
A running race consists of two stages. Two thirds of the competitors completed the first stage, and only three quarters of those completed the second stage. Only 12 competitors reached the finish line. Determine how many competitors started and how many d - Trainers 3
Groups of trainees are arranged in rows of six, eight, nine, and ten. Each time there is one trainee left over. How many trainees were there? - From a full
From a full cylindrical glass with a diameter of 8 cm, 1 decilitre of water was poured out. By how many centimetres did the water level in the glass drop? - Boxes
Cuboid-shaped boxes without a lid are to be painted on all sides, both inside and outside. The base dimensions are 60 cm × 30 cm and the height is 12 cm. How many cans of paint are needed to paint 10 such boxes if one can covers 4 m²? - Storm 4
Approximately 4,000 trees grow on 1 hectare of forest. During the storm of 20 November 2004, 95% of the trees on 100 km² of the High Tatras forest cover were destroyed. How many trees were destroyed? - Asphalt - road
2,933 kg of asphalt is how many m³? Use the density of asphalt as 2,400 kg/m³. Note: Natural asphalt (bitumen): 1,010–1,050 kg/m³ Asphalt mixture (for roads): 2,200–2,500 kg/m³ (Contains mineral aggregates, so it is denser.) - Into the bottle
A bottle can hold water weighing no more than 1 kg. Can the same bottle hold gasoline of the same mass? - Calculate 263
Calculate the area of a rhombus whose diagonals are u = 12 and v = 19. - Bathroom 3 A bathroom measures 300 × 210 cm. What is the largest square tile size that can be used to cover the floor without cutting, and how many such tiles will be needed?
- Reward - division
Mum promised the children a reward of 330 euros for their help. How should they divide the money if George helped for 10 days, Emma for 8 days, and Hannah for 12 days? - All zeros
How many zeros does the product of the numbers 10 × 11 × 12 × 13 × 14 × 15 × 20 × 21 × 22 × 23 × 24 × 25 end with? - In an aquarium 3
In an aquarium 60 cm long and 30 cm wide, water is poured to a height of 25 cm. Determine the mass of the water in the aquarium. - Saleswoman 3
A saleswoman cut 650 cm from a piece of batten that was 30 metres and 60 cm long. How much of the batten did she have left?
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