Maths practice for 12-year-olds - page 265 of 362
Number of problems found: 7227
- Illuminates 4961
The lamp illuminates a circle with a diameter of 10m. What area does the light illuminate? - Irrigates 4958
The water jet for welding the lawn reaches a distance of 1.8 m. How much is the lawn irrigated? - Increase 4957
How does the area of a circle change if we double its radius? How many times does its area increase? - Oil tank and pipes
Two oil pipelines can fill the underground oil tank. The first is filled in 72 hours, and the second in 48 hours. How many hours from when the first pipeline began to fill the oil is necessary to start filling it with the second to fill in 1 and 1/2 days? - Four circles
1) Calculate the circle radius if its area is 400 cm square 2) Calculate the radius of the circle whose circumference is 400 cm. 3) Calculate circle circumference if its area is 400 cm square 4) Calculate the circle's area if the perimeter is 400 cm. - Father 4952
A father and son mow the lawn in 3 hours. How much would a father do on his own if they both cut just as fast? - Calculate
Calculate the area of a circle whose radius is 5 dm.
- Workers 4949
The three workers will dig one big pit in two days. How many workers would dig seven large pits in three days? - Annulus
The radius of the larger circle is 8cm, and the radius of the smaller is 5cm. Calculate the area of the annulus. - Alarm clock
The old watchmaker has a unique digital alarm in its collection that rings whenever the sum of the alarm's digits equals 21. Find out when the alarm clock will ring. What is their number? List all options. - The surface
The cuboid's surface area is 1714 cm2, and the edges of the base are 25 cm and 14 cm long. Find the area of the surface. - Every day 7 pages
Anelka reads the book seven pages every day. When she reads one more page a day, she will read it three days earlier. How long will Adelka read a book? How much does a book of pages have? - Square prism
Calculate the volume of a square prism of high 2 dm wherein the base is: Rectangle with sides of 17 cm and 1.3 dm - Sea water
One tonne of seawater contains 25 kg of salt. How many tonnes of seawater needs to be evaporated to obtain 1 tonne of salt? - Study
For 7 hours of study, she scored a 75, so if she made 93, how many hours would she need to study?
- Flowerbed
The flowerbed has a length of 3500mm and a width of 1400mm. How much foil is needed to cover the flowerbed? How many m² of foil was consumed for its production (add 10% of the material to the joint and waste)? How many liters of air is inside the enclosur - Surface area Calculate the surface area of a four-sided 2-m high prism whose base is a rectangle with sides of 17 cm and 1.3 dm.
- The tram
The tram is moving with acceleration a = 0.3m/s2. How long will it pass the first meter of the track? How long does it take 10 meters? What is its speed at the end of the 10-meter track? - Magic belt
The magic rectangular belt has the property that whenever its owner wants something, the length of the belt is reduced to 1/2 and the width to 1/3. After three such wishes, the belt had an area of 4 cm². What was its original length if the original width - Photo egative
Negative dimensions are 36mm and 28mm. What will the photo size be in the 21:4 ratio?
Do you have unsolved problem that you need help? Ask a question, and we will try to solve it. Solving math problems.
