Maths practice for 12-year-olds - page 319 of 351
Number of problems found: 7009
- Tiles
How much will you pay CZK for laying tiles in a square room with a diagonal of 8 m if 1 m² cost CZK 420? - Round it
0.728 round to units, tenths, hundredths. - Rectangle - desc circle
The length of the sides of the rectangle is at a ratio of 1:3. The circle's radius circumscribed to the rectangle is 10 cm. Calculate the rectangle's perimeter. - Water container
The container with water weighs 1.48 kg when we cast 75% of the water content of water weight 0.73 kg. How heavy is an empty container? - Cows
Four cows spent 16 bags of hay in 5 days. How many bags of hay sacks are needed for five cows for seven days? - Ski tow
The ski club has 168 pupils and uses a lift with 60 seats. Students always follow the same sequence in filling seats. How often does a skier sit in the same seat as the first run while riding a ski lift? - Trapezoid ABCD
ABDC is a trapezoid in which AB and CD are parallel sides measuring 6 and 9, respectively. Angles ABC and BCD are both right angles. Find the length of segment BD. - Ski class
The class consists of 30 boys and some girls. Ski training was attended by 28 boys and all the girls, which was 95% of all students. How many girls attend this class? How much percent is that? - Lawns
Before a sports hall are two equally large rectangular lawns measuring 40 m and 12 m. Maintenance of a 10m² lawn costs 45 CZK yearly. On each lawn is a circular flowerbed with a diameter of 8 meters. How much money is needed each year to take on lawn care - Water tank
The water tank shape of the cuboid has dimensions of the bottom 7.5 meters and 3 meters. How high will reach the water in the tank will flow 10 liters of water per second, and will the inflow be open for 5/6 hours? (Calculate to one decimal place, and the - Apples
Mr. Vesely gives the market his own 48 kg of apples, 40 kg from Mr. Kovar, and 72 kg from Mr. Novak. They earned a total of 1,920 CZK. How must we divide income money for apples? - String
Divide the string length 800 cm in ratio 1: 5 - The exhibition
The teacher charged 280 CZK for four students' admission to the exhibition. How many students were at the exhibition? Hint: the admission cost is a whole number. - Lesson exercising
In the lesson on physical education, pupils are first divided into three groups so that each has the same number. They redistributed, but into six groups. And again, it was the same number of children in each group. Finally, they were divided into nine eq - Rabbit family
The rabbit family ate 32 pieces of carrots. The small one ate six pieces, and the dad five more than the mother. How many pieces did Mom eat? - Area of the cone
Calculate the surface area of the cone. You know the base diameter is 25 cm, and the height is 40 cm. - Wood
Wood density is 0.6 g/cm³. How many kilograms weigh one m³ of wood? - Chord distance
The circle k (S, 6 cm) calculates the chord distance from the center circle S when the chord length is t = 10 cm. - Angles in triangle
Calculate the angle alpha in the triangle if the beta is 61 degrees and 98 gamma degrees. - Internal and external angles
Calculate a triangle's remaining internal and external angles if you know the internal angle γ (gamma) = 34 degrees and one exterior angle is 78 degrees and 40 '. Determine what kind of triangle it is from the size of its angles.
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