Maths practice for 11-year-olds. - page 30 of 227

Number of problems found: 4525

Number digital sum
Calculate the digital sum of the given numbers and arrange the results in descending order: 356,1078,39,4402
Dimension of foundations
The foundation pit for building houses has a face of blocks with dimensions of 10 meters, 10 meters, and 2 meters. After a heavy rain, the water is filled to the brim. The pump pumps out 10 m³ of water in 1 hour. In how many hours will the pit be empty?
Notebook purchase rounding
Lucy bought a notebook for CZK 28.60 and a notebook for CZK 14.50. How many crowns did the saleswoman round off the price of her purchase? How many CZK did she return to fifty crowns?
Mercury density measurement
10 ml of mercury has been measured to weigh 0.135 kg. Calculate the density of mercury and compare it with the density shown in the tables.
Multiple smaller nearest
Write the nearest smaller multiple: number 7 to number 23 number 5 to number 19 number 6 to number 23 number 10 to number 79 number 6 to number 41 number 3 to number 28
Rhombus construction sides
Construct a rhombus that has a side length of 5 cm and a height of 4.5 cm. Outline: Analysis: Construction: Method:
Ring gold volume
The ring weighs 28 g and has a volume of 2 cm³ to find out if it is made of pure gold.
Martin age years
Martin will be twice as old in 10 years as he was four years ago. How old is he now?
Cuboid cone volume
We used the same amount of paint to paint a cuboid with dimensions of 10 cm, 15 cm, and 3 cm to paint the shell of a cone whose radius is 8 cm. How tall is this cone? Calculate its volume in liters.
Tablecloth table size
A square tablecloth measures 80 cm so that it protrudes 33 cm on the sides; calculate how big it is.
Cube edge volume
The sum of the lengths of all the cube's edges is 60 cm. How to calculate its volume?
Pool sidewalk fence
The rectangular pool has dimensions of 12 m and 25 m. They built a 2-wide sidewalk around the pool and a fence around the sidewalk. How long is the fence if they leave 1 m for the entrance hole?
A pot - volume
Approximately how many liters of water are there in a pot with a base diameter of 32 cm and a height of 25 cm?
School bun distribution
There were buns for lunch at school. The freshmen ate one-eighth of the buns. The sophomores ate two-eighths of the buns. Third and fourth graders ate three-eighths. How many eighths of the buns are left for the upper grades?
Roland plot perimeter
Roland rode his bike around the perimeter of the square plot and traveled 5 km. What is the length of the side of a square pitch?
Aquarium depth capacity
The aquarium is 0.7 m long and 25 cm wide. The battery is deep if it can hold no more than 87.5 liters of water. I need help understanding how to calculate this.
Aquarium water total
The zoo purchased two aquariums for marine animals. The first can hold 3,577 liters of water. The second aquarium can hold 455 liters less water than the first. How many liters of water can the aquariums hold together?
Circle triangle hole
Calculate the area of the circle in which the hole is cut in the shape of an equilateral triangle when the diameter of the circle, d=32 mm, and the side of the triangle, a=20.8 mm.
Cylindrical pool
The Novak family bought a cylinder-shaped pool with a base radius of 200 cm and a volume of 31.4 hl. Could the grandson safely jump if he is 120 cm tall?
Mom cake remainder
Mom baked cakes. She set aside a third of them for her father. She left the rest on the table. Rick came and ate a third of the cakes that were on the table. What fraction of all the cakes was left on the table? Write the result in fractions.

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