Maths practice for 12-year-olds - page 278 of 355
Number of problems found: 7081
- Cuboid surface
Determine the surface area of the cuboid if its volume is 52.8 cm cubic and the length of the two edges are 2 cm and 6 cm. - Cuboid - Vab
Find the surface of the cuboid when its volume is 52.8 cubic centimeters and the length of its two edges is 2 centimeters and 6 centimeters. - Equation
Find x: x + 1/2 = 1/3 - Equation test
Calculate and perform the test. 3a / 2 + 5/6 = a / 3 - 3/2 - Surface of wall
Find by what percentage the cube's surface will decrease if we reduce the surface of each of its walls by 12%. - Cube diagonals
Determine the wall and body diagonal of the cube, with the surface of one of its walls being 121 square centimeters. - Unknown number
I think the number - its sixth is three smaller than its third. - Wheel diameter
What is the diameter of the wheel when it turns 455 times per 1 km? They rounded to the nearest cm. - Simple equation
Solve for x: 3(x + 2) = x - 18 - Vacuum efficiency
Determine the efficiency of a vacuum cleaner with a power input of 1.2 kW when the suction power is 360 W. - Speed reader
Petr reads 12 pages of the book in 1 hour. Express a fraction of what part of the book it will read in 5 hours if it has 280 pages. - Efficiency
What is the power output of a kettle 2 kW with an efficiency of 90%? - Performance time
The theatrical performance began at 7:30 PM and lasted two-quarters of an hour with one 20-minute break. What time did the show end? - Tree planting
Twenty students will plant 1,200 trees in 4 hours. How many students do you need to plant 2100 trees in 3 hours at the same performance? - Plane II
A plane flew 50 km on a bearing of 63°20' and then flew in the direction of 153°20' for 140km. Find the distance between the starting point and the ending point. - Simple equation
Solve the following simple equation: 2. (4x + 3) = 2-5. (1-x) - Garden
A Garden with an area of 800 square meters rained 3 mm of water. How many 10-liter cans of water are needed for the same irrigation? - Cylinder surface
Find the surface of the cylinder if its diameter is 12 centimeters and its height is 9 centimeters. - Crane speed
The crane in the assembly hall will move by 22.5 m in 1 1/4 minutes. What speed does it move if it is a steady movement? - Unknown number 11
That number increased by three equals three times itself.
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