Maths practice for 12-year-olds - page 289 of 359
Number of problems found: 7167
- Percentage calculations
Calculate to two decimal places. What percentage is: a / 15min from 4 h b / 35 cm² of 12.5 dm² c / 2 dm² of 400 cm² d / 0.2 l of 2.2 l - Map distance
On a tourist map with a scale of 1:20 000, the distance between Starý Smokovec and Nový Smokovec is 24 cm. What is the actual distance? - Equation with x
Solve the following equation: 2x- (8x + 1) - (x + 2) / 5 = 9 - Road length
What is the actual length of the road, which measures 5 cm on a 1:250000 scale map? - Circle length
The 16 cm long string is 6 cm from the circle's center. Calculate the length of the circle. - Chord distance
There is a 12 cm long chord in a circle with a radius of 10 cm. Calculate the distance of the chord from the center of the circle. - Unknown number
If we multiply the number by 4, I get a third of the number 36. Specify an unknown number. - Price increase
They increased the price of the social word game SCRABBLE from SKK 600 to SKK 900. By what percentage did they increase the price of the game? - Hall
A rectangular hall is to be paved with square tiles with a side length of 15 cm. The hall has a length of 18 meters and a width of 3 m. How many tiles do you need to buy if 2 percent of the amount are damaged during the work? - Hypotenuse length
Calculate the hypotenuse length if you know the area of an isosceles right triangle that is 24.5 cm². - Triangle construction
Draw a circle k (S, r = 3 cm). Build a triangle ABC so that its vertices lie on the circle k and the length of the sides is (AB) = 2.5 cm (AC) = 4 cm - Active pupils
There are 35 pupils in the class, and 7 of them are active in sports. What is their percentage? - Mushroom water
A fresh mushroom weighs 8 kg. After drying, it weighed 96 dag. What percentage of water do fresh mushrooms contain? - Potato flour
Nine tons of potato flour are obtained from 50 tons of potatoes. What percentage by weight of potatoes is potato flour? - Scrap percentage
Quality control found that out of 4,200 products, 3,074 were perfect. What percentage did the scraps represent? - Equation and inequality
Example1: Solve a linear equation and perform a test: 6x- (3x + 2) = x-8 Example 2: Solve a linear inequality: 3y + 2 * (y + 1) ≥2y-7 - Price increase
The bakery increased the price of croissants from 1.90 CZK to 2.50 CZK. By what percentage did the bakery rise in price? - Cabinet painting
The cabinet for storing garden tools is shaped like a cube with an edge length of 2 m. How many m² of paint will we need to paint this cabinet if we paint everything except the bottom base? How much will it cost to paint a cabinet if one can of paint for - Iron extraction
Iron ore contains an average of 35% iron. How much iron is obtained by melting 300 tons of iron ore? - Cyclist route
The cyclist drove two-fifths of the way on the first day and three-eighths on the second day. He still has 45 km to go to the finish. a) What is the length of the whole trip? b) How many km has he covered?
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