Maths practice for 12-year-olds - page 145 of 347
Number of problems found: 6923
- Ratio to total
7:12 is the ratio of orchids to tulips. What is the ratio of the number of orchids to the total number of flowers in the garden? - Square size change
Resize the square to 7:3. The original size is 39 cm. What is the size of the square after the change? - Card drawing round
Each of the three players draws 3 top cards from the deck of 54 cards and returns one card to the deck below. The first, second, and third players alternate regularly. In which round does the first player draw the card he got rid of in the first round? - Divide an isosceles triangle
How can an isosceles triangle be divided into two parts with equal areas perpendicular to the axis of symmetry (into a trapezoid and a triangle)? - The gift
How much wrapping paper is needed to wrap a cube-shaped gift with an edge measuring 15 cm? - Double six-six
What is the probability that a player in the games of ludo will throw a double six twice? - Sprinkler irrigation area
The rotary sprinkler has a spray of 18 m. How much land can it irrigate from one place? - Sprayer grass area What grass area can the automatic sprayer spray if it is set to spray at an angle of 120 ° and the water sprays up to a maximum distance of 5 meters?
- Alarm hand distance
The minute hand of the alarm clock is 3.5 cm long. How long will the tip of the hand be described in 1/2 hour? - Minute hand area
What is the area of the circular cutout described by the minute hand 14 cm long in 40 minutes? - The collar
The collar on the dress has the shape of an annulus 6 cm wide. The circumference of the inner circle is 31.4 cm. How much is cm² of fabric needed to make one collar? - Glazing workshop
Roof arches have the shape of an equilateral triangle. The length of the side of the arch was 0.6 m and the height 0.52 m. How many m² of glass are needed for glazing 48? - Prism height
The volume of the triangular prism is 200 dm3, and the base is a triangle with a side of 10 dm and a corresponding height of 5 dm. Calculate the height of the prism. - Roxville
The temperature in Rockville decreased by 15 degrees in five hours. What was the average decrease in temperature per hour? Write your answer as an integer. - Board weight
Calculate the weight of a wooden board 18 dm long, two dm wide, and 0.3 dm thick if you know that 1 m³ of wood weighs 660 kg. - Milk cream
They used a quarter of the imported milk to make butter, half to make a cream, and 100 liters to make cottage cheese at the dairy. How many liters of milk was used to make the cream? - Passenger boat distribution
During the rescue of a sinking ship, the passengers were divided among three lifeboats in a ratio of 3:4:5. The first boat carried 15 passengers. How many passengers were rescued in total? - Natural number creation
How many natural numbers can you make from the digits contained in the number 4002? No digit may be repeated in the number entry. However, not all digits must be used. Sort the numbers in ascending order of size. - Mushrooms
Mr. Mushar collected mushrooms. One-fifth he gave to neighbors, one-third to dry, and divided the remaining mushrooms into three equal parts: himself, son, and daughter. Daughter Dominika got 42. How many mushrooms did he collect in total, and how many mu - Snow wall
The boys want to build a defensive wall out of the snow for the ballpark. They want it to be 5 meters long and 1.5 meters high. They can make and transfer 50 cm cubes from snow. How many such cubes must he make to build his wall?
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