Maths practice for 12-year-olds - page 228 of 350

Number of problems found: 6985

Centimeters 6604
A four-sided prism has a volume of 648 cubic centimeters. The trapezoid that is its base has the dimensions a is equal to 10 centimeters, c is equal to eight centimeters, and height v is equal to 6 centimeters. Calculate the height of the prism.
Circumference 6598
Adam had three identical rectangles. He put them together and got a rectangle with a circumference of 50 cm. Then, he placed them differently and got a rectangle with a larger circumference. Calculate its perimeter.
Triangular prism
Calculate the surface of a regular triangular prism with a bottom edge of 8.5 meters and an appropriate height of 60 meters, and the prism height is 1.4 meters.
Three-quarters pool
How many liters of water are in a cube-shaped pool with dimensions equal to 3 whole six meters b equals one full 9 meters and a depth of one total 5 meters if it is filled to only three-quarters of its volume?
Three friends
Three friends had balls in a ratio of 2:7:4 at the start of the game. Could they have the same number of balls at the end of the game? Write 0 if not, or write the minimum number of balls they had together.
The rod
The rod has the shape of a regular hexagonal prism with a volume of 32.4 cubic decimetres. What is the area of the base if it is 350 centimeters long? Round to ones.
Centimeters 6583
Calculate how much we will pay for the paper to cover the box in the shape of a three-sided prism with the base of a right-angled triangle; if the overhangs measure 12 cm and 1.6 decimeters, the hypotenuse measures 200 millimeters, the box is 27 centimete
Pupils 6579
There are 169 pupils, 45 rooms, how many rooms are three beds and how many five beds?
Multiple 6577
Father gave Lucia €20 for a new curtain. Due to the pleating, the curtains are wider than the window width of 2 meters. Lucie spent all her money on the curtain, which cost 7.90 Euros per meter. Is the curtain a multiple of the width of the window?
CZ flag
What percentage of the Czech flag comprises blue, white, and red textiles?
The volume
The volume of a solid cylinder is 260 cm³. The cylinder is melted down into a cuboid whose base is a square of 5cm. Calculate the cuboid's height and surface area.
Book reading
If we read the book at a speed of 15 pages a day, we read it three days before we read it at a speed of 10 pages per day. If I read six pages per day, how many days will I read the book?
Customary length
Convert length 65yd 2 ft to ft
Triangular prism
Calculate the volume of a triangular prism 10 cm high, the base of which is an equilateral triangle with dimensions a = 5 cm and height va = 4,3 cm
Barrels
Peter has 42 barrels. One-sixth of them are filled with lemonade, one-third are filled with wine, and half are empty. Calculate how many barrels are with each filling.
Percent 6567
Jana spent CZK 366 on books, which was 75 percent of her savings. How much CZK did Jana have saved?
[square] 6565
How many tiles with a side length of 20 cm will cover a square with a capacity of 1 m² [square]?
Equations: 6562
Solve the equations: (3n-3) / 3 = (9 + 2n) / 2 2x / 4 - 3 = 1 / 2x + 1
Quadrangle prism
Find the volume of a quadrangle prism high 2 dm whose base is a square with a side of 15 cm.
Circumference 6555
The square picture has a circumference of 28 dm, and its frame is 7 cm wide. What is the outer circumference of the frame?

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