Maths practice for 12-year-olds - page 234 of 347

Number of problems found: 6932

The farmer
The farmer had 140 sheep. For the next year, she decided to change the number of sheep in a ratio of 10:7. How many sheep would he have then?
Column covering
At the foot of the house are three columns with a square base 2.5 m high and 6 dm thick. How much do we pay if we want to cover them with boards and the company charges 12 euros per 1 square meter?
The female teacher
The female teacher wrote two numbers on the blackboard under each other and called on Adam to add them. Adam correctly added them and wrote the result 39 below the given numbers. The teacher erased the topmost number, and thus the remaining two numbers fo
Dividing Rectangular Plot
Jan bought a large rectangle plot with a circumference of 90 meters. He divided it into three rectangular plots. The shorter side has all three plots of the same length. Their longer sides are three consecutive natural numbers. Find out each plot's dimens
Recipe Ingredients for Servings
According to the recipe, 0.8 kg of rice, 0.65 kg of meat, 300 g of carrots, 60 g of peas, 50 g of fat, and 10 g of salt are used to prepare 10 portions of dietary risotto. What weight of these types of food will need to be used to prepare 15 servings of r
Car Sales Amount Possibilities
They sold three Škoda cars in one day at the car dealership. After rounding the entire amount to the nearest ten thousand, the store used CZK 900,000. Please write at least five possibilities of how much they could take.
Drug Use in School
According to research, one-quarter of pupils will encounter drugs at the end of primary school. Of this number, 40% of pupils try the drug. How many students attend Year 9 if 12 have signed up to use drugs?
Chair Pressure Floor Area
The weight of the pupil and the chair is 52 kg. The area of the contact surfaces of the chair with the floor is 12 square centimeters. What pressure does the chair put on the floor?
Tank Weight Pressure Ground
The tank's weight is 36 t, and the total contact area of the belts with the ground is 4 square meters. What pressure does the tank cause on a horizontal surface?
Thomas
Thomas lives 400 meters away from Sam, Rob from Thomas also 400 m, and Sam from Rob 500. Anthony lives 300 meters away from Rob, further than Sam. How far away lives Anthony from Rob?
Glass Paperweight Weight
The glass paperweight has the face of a sphere with a radius of 4 cm. Estimate and then calculate its weight. The density of glass is approximately 3800 kg/m³.
Hours 3
How many hours are in 3 2/3 days?
The rainwater
The rainwater container has the shape of a block whose bottom has dimensions of 4.5 m and 3.5 m. It is partially filled with water. What is the level if there is 189 hl of water in it?
Basen
How many square meters of tiles do we need to tile the walls and floor of the pool, 15 meters long, six meters wide, and two meters deep?
Buy Six Pay Four
There was an offer for item B: If you take six pieces, you only pay for four. One piece of this product costs 7 euros. Maria took 31 pieces of this product to her basket. How many euros did she pay for this item?
Employees Language Course Proportion
There are 600 employees in a certain company. Last year, three-fifths of them took a language course. This year, the number of employees with the course increased by 40. What proportion of the employees now has a language course?
Wheel Travel Distance
How many m did a wheel with a diameter of 22 dm pass if it stopped after 30 turns?
Circular Sidewalk Area
A sidewalk is 70 cm wide around the circular law and has a radius of 2.3 m. How many square meters does the sidewalk have?
Triangular RT prism
Calculate the volume and surface of a triangular prism whose base is a right triangle with sides a = 3 m, b = ha = 4 m, and c = 5 m. The height of the prism is v = 5.5 m.
Additional Workers Needed
Certain work was to be done by 21 workers during an eight-hour workday, due in 12 days. After five days, temporary workers came to their aid. They all worked together for 7 hours a day and finished the job in 6 days. How many part-timers were there?

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