Maths practice for 12-year-olds - page 260 of 347
Number of problems found: 6932
- Juice box
The juice box has a volume of 200 ml, and its base is an isosceles triangle with sides a = 4,5 cm and a height of 3.4 cm. How tall is the box? - Cremons
The freight wagon is shaped like a cuboid 21m, 3.5m, and 4.2m. How many cube-shaped dorts can be loaded if one is a cube with an edge length of 7 cm? - Stones in aquarium
In an aquarium with a length of 2 m, a width of 1.5 m, and a depth of 2.5 m is a water level up to three-quarters of the depth. Can we place stones with a volume of 2 m³ into the aquarium without water being poured out? - Reading pages
Tomáš and Lukáš read the same book. Tomas read 21 pages a day and read it one day earlier than Luke, who read 18 pages a day. How many pages did the book have? - LCD 2
The least common denominator of 2/5, 1/2, and 3/4 - Highway
Six trucks will be used to build the roadside for 18 days. After three days, the company sent two more trucks to make. How long will it take for the material to move? - Czech crown salary
The employee's monthly salary is CZK 10,800. In the course of the year, the bulk salary increased by CZK 500. Calculate which employer increased month (1 ... 12) if its annual income was 133,600 CZK. - Light area
The lamp illuminates a circle with a diameter of 10 m. What area does the light illuminate? - Lawn irrigation
The water jet for welding the lawn reaches a distance of 1.8 m. How much is the lawn irrigated? - Circle area increase
How does the area of a circle change if we double its radius? How many times does its area increase? - Four circles
1) Calculate the circle radius if its area is 400 cm² 2) Calculate the radius of the circle whose circumference is 400 cm. 3) Calculate circle circumference if its area is 400 cm² 4) Calculate the circle's area if the perimeter is 400 cm. - Lawn mowing
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 digging
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 8 cm, and the radius of the smaller is 5 cm. 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. - Square prism
Calculate the volume of a square prism with a height of 2 dm and a base that is a 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?
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