Maths practice for 12-year-olds - page 279 of 351
Number of problems found: 7018
- 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%. - Centimeters 4081
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. - Diameter 4078
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 - Efficiency 4073
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%? - Two-quarters 4068
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? - Performance 4067
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? - Centimeters 4054
Find the surface of the cylinder if its diameter is 12 centimeters and its height is 9 centimeters. - Movement 4049
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. - Property 4047
Seven times the number minus 3 is as big as three times the same number minus 7. Which number has this property? - Through 4045
We should fill the water tank with a volume of 100 hl to 2/3 of the volume. How long does the filling take if 2.5 l of water per second flows through the hose? - Transferred 4040
The cowboy has 25 horses in two pens. He transferred 5 from the first to the second, then sold 7 horses from the second. How many horses were originally in the first pen? In the first enclosure, there were just 2 times more horses than in the second enclo - Trapezium bases
Find the trapezium's height if a = 8 cm and c = 4 cm, and its area is 21 square centimeters.
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