Maths practice for 12-year-olds - page 275 of 347

Number of problems found: 6923

Rectangular garden 4F
The fence around the rectangular garden measures 264 2/3 m. The length of the garden is 79 1/4 m. How wide is the garden?
Cylinder height
The rotating cylinder has a diameter of 14 cm and a surface of 1,186.92 cm². Calculate the height of the cylinder.
Equation value
What is the value of x in this equation: 2.5x: 4 = 7.5. x is a natural number.
Number increase
Increase number 160 by: a) 25% b) 30% c) 150%
Expression calculations
Calculate: a) 23 - [2.6 + (6 - 9) - 4.52] b] 12.25 + 2 [2.7 - (-0.5 + 0.3 * 0.6)]
Average temperature
The following temperatures were measured every 6 hours from 6 to 24 hours: -2.2 C, 2.1 C, 5.4 C, 3.9 C, 0.7 C, -1.9 C, -3.8 C. Calculate the average temperature from 6 to 24 hours.
Lcm simple
Find the least common multiple of these two numbers: 140 175.
Square s3
Calculate the square's diagonal, where its area is 0.49 cm². And also calculate its circumference.
Average speed
The car left at 9:00 AM and arrived at the destination 144 km away at 11:00 AM. What average speed did he move?
Ball count
Roland has 490 balls. If he gave 145 bullets to Mark, he would still have 100 more bullets than Mark. How many balls did Mark have at the beginning? How many shots do they have together?
Dimensions of glass
An aquarium has dimensions of 64 × 50 × 45 cm and is filled to 5 cm below the upper edge. How many liters of water are in an aquarium? How many square meters of glass are needed to produce an aquarium?
Rails
18 m railway weighs 1260 kg. How much weighs 100 m of welded railways?
Unknown number
16% of the unknown number equals the square root of the number 25. Find this unknown number.
Square diagonal
Determine the diagonal of a square whose perimeter is equal to 72 cm.
Expression evaluation
For the variables x = -8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z)
Average speed
At what average speed would you have to travel around the world in 80 days? (Assume a path along the equator; round to km/h.)
Square diagonal
Calculate the diagonal of a square whose area equals 625 square centimeters.
Expression evaluation
For the variables x = 8, y = 12, z = -5, evaluate these two mathematical expressions a = y-z b = z / (x-z)
Cube measurements
The surface area of one cube wall is 2500 square millimeters. Determine the cube's surface, the length of its edge, and its volume.
Cube 5
The surface area of one cube wall is 32 square centimeters. Determine the length of its edges, its surface, and volume.

Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.