Maths practice for 12-year-olds - page 273 of 347
Number of problems found: 6932
- 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 140 km. 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
What number, when increased by three, equals three times itself? - Number property
Seven times the number minus 3 is as big as three times the same number minus 7. Which number has this property? - Tank filling
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? - Horse pens
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 - Safe codes
Mr. O. came up with two codes for the vault, which he alternates after a week. Both codes have the product of the digit 120. In an even week, it uses the smallest possible number as the code with this property. In the odd week, the largest. No number 1 in - Ornamental shrubs
Children committed to planting 240 ornamental shrubs. Their commitment, however, was exceeded by 48 shrubs. Write the ratio (r) of actually planted shrubs and commitment by the lowest possible integers a/b. - Solving the equation
x + 6/6 -x-3/3 = 3/4
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