Maths practice for 12-year-olds - page 194 of 351
Number of problems found: 7018
- Expression unknown calculation
The expression 2n + m = 52, please express an unknown n. - Volume of the cone
Find the volume of the cone with the base radius r and the height v. a) r = 6 cm, v = 8 cm b) r = 0,9 m, v = 2,3 m c) r = 1,4 dm, v = 30 dm - Office painting cost
Our office has dimensions of 5 m by 4.5 m and a height of 2.5 m. How much will it cost to paint it if a liter of paint costs €3.50 (yield 10 m²/l) and the painter asks €1.20 for the job and 1 m² painting? It will need to be painted twice. - Fiona Shrek meeting
Fiona sets off from the tower after Shrek at 9:10 at a speed of 6 km/h. Shrek starts to meet her from the swamp at 9:50 at a speed of 4 km/h. At 10:50, they meet and return back to the swamp at a speed of 4 km/h. What time does he arrive at the swamp? - Aquarium water calculation
The aquarium has the dimensions a = 250 cm, b = 50 cm, and c = 60 cm. Water is poured into the aquarium up to 45 cm. Do you calculate how many liters of water are in the aquarium? - Calculate
Calculate the surface of a regular quadrilateral prism whose base edge is 2.4dm and the height of the prism is 38cm. - The prison ball
Calculate the density of the material from which the prison ball is made if you know its diameter is 15 cm and its weight is approximately 2.3 kg. With the help of mathematical-physicochemical tables, estimate what material the ball is made from. - Two dogs
Izzy's dog is 10 1/2 years old. Paige's dog is 18 months old. How many years older is Izzy's dog? - Room wallpaper calculation
Sophie decided to wallpaper one side of her room. How much wallpaper does she need if the wall measures 3 m by 2.4 m? - Equilateral triangle circle
There is a circle with a radius of 2.5 cm and point A, which lies on it. Write an equilateral triangle ABC in the circle. - Weigh in total
I put 3/5 kg of grapes into a box, which is 1/4kg in weight. How many kilograms do the grapes and the box weigh in total? - Cross five
The figure in the picture is composed of the same squares and has an area of 45 cm². What is its perimeter? - Pizza
Three siblings ordered one pizza. Misha ate a quarter of the whole pizza. Helen ate a third of the rest, and Patrick ate half of what Helen had left. They had the rest packed up. How much of the pizza did they pack? Write the result as a fraction. - Square triangle area
Square has the side a = 12 cm. Calculate the area of a triangle in the square. - Vlado step calculation
Vlad walks at a speed of 4 km/h. Its step is 0.8 m long. How many steps will he take in 12 minutes? - Harvester field calculation
Five combine harvesters shit in 12 days. How long does a 2-fold larger field of combine harvesters take? - Snow White 2019 MO Z7
Snow White with her seven dwarfs gathered pinecones for a bonfire. Snow White said that the number of all pinecones is a number divisible by two. The first dwarf stated that it is a number divisible by three, the second dwarf said that it is a number divi - Two trains
Two trains departed from City A and City B against each other. They met after some time. The first train took 9 hours to reach city B, and the second took 4 hours to reach city A. In what proportion were the train speeds? - A plasticine
Joseph modeled from plasticine. He used 27g of plasticine to model a 3 cm long cube. How many grams of plasticine will it need to mold cubes with an edge of 6cm? - Length of the edge
Find the length of the edge of a cube with a cm² surface and a volume in cm³ expressed by the same number.
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