Maths practice for 12-year-olds - page 235 of 347
Number of problems found: 6932
- Unknown number
Find a number that is by eight larger than its third. - Volcano
The volcano's crater is approximately in the shape of a cone with a base of 3.1416 square miles. The crater's depth is 1500 ft. How many cubic yards of earth would be required to fill this cavity? - Cube cutting
We cut identical cubes with an edge length of 2 cm from two corners from a wooden cube with an edge of 0.6 decimetres. How many cubes with an edge length of 2 cm can still be cut from a wooden cube? - Trapezoid - sides
Calculate the unknown side and the area of the ABCD trapezoid if you know: side a = 7.5 side b = 3.6 side d = 4.4 height v = 3.4 circumference o = 19 c =? S =? - Circular arc
Calculate the length of the circular arc if the diameter d = 20 cm and the angle alpha = 142 ° - Tablecloth Border Length
For a round table with a diameter of 75 cm, you need to sew a tablecloth that should extend 10 cm around the table. A 1.5 cm slat is added to the border. How many square meters of lath do we need for this table? - Two brothers
The two brothers were to be divided according to the will of land at an area of 1ha 86a 30 m² in a ratio of 5:4. How many will everyone get? - Granite sidewalk
On the sidewalk, 3 m wide and 8 m long, 2 m³ of mosaic stone (granite cubes) was used. The master of tiles had to pave the sidewalk 2.5 m wide and 65 m long. How much m³ of the stone does it consume? - Water Tank Level
There are 20,000 liters of water in a block-shaped tank with 5 m and 4 m bottom dimensions. What is the water level? - Cube Edge and Volume
The cube has an area of 5400 cm². What are the length of its edge and the volume of the cube? - Together
If eight men, ten women, and 16 children collect ₹1,024 in 4 days, how many days will six men, five women, and four boys need to collect ₹768? (₹ is the Indian Rupee.) - Hockey card donation
Juraj donated three-fifths of his collection of hockey players to his friend Josef. He has 100 cards left. How many cards did Juraj initially have in his collection before the donation? - Polynomial simplification
Simplify polynomial entry: (x + 2)² + (x-2) (x + 2) - Students Learning Languages
There are 32 students in the class. Twenty-six of them are learning English, 15 are learning German, and four are learning only French. How many students are learning English and German? - Our horses
Our horses have a supply of oats for 12 days. Our neighbour has half as much oats as we do, but twice as many horses. a) How many days would our supply of oats last our neighbour's horses? b) How many days would our neighbour's supply of oats last our hor - Square prism
A square prism has a base with a length of 23 centimeters. What is the area in square centimeters of the base of the prism? - The product The product of the three numbers is 224. The first is 10, and the second is 50 times smaller than the first. Calculate the third number.
- Diamond - Equilateral Triangles
We composed the diamond of four equilateral triangles with a side length of 7 cm. What is its perimeter? - Sand
The maximum weight of the car is 5000 kg. We must transfer 10 m³ of sand. How many times does a car have to go? (density of sand is 1500 kg/m3) - Two Classes Trip Students
A total of 56 children went on a trip to the pupils of the two fourth grades. That 4A was four pupils more than 4. B How many pupils from each class went on a trip?
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