Maths practice for 12-year-olds - page 281 of 347
Number of problems found: 6923
- 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 - Equation with x
Solve the following equation: 2x- (8x + 1) - (x + 2) / 5 = 9 - 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? - 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? - The sidewalk
The sidewalk is 50 m long. On a scale of 1:200, what will the length of the plot plan be? - Distance from Prague
The direct distance between Prague - Valencia is 1680 km. How far apart are these cities on the scale map 1:4000000? - Triangle height
Calculate the height size in the triangle ABC if the side length a = 20 cm and the area of the triangle is 50 cm². - Equation solving
Solve the equation: 12- (12-5x) = 3x + (x-4) - Equation 16 + 2x-7 = 5x + 10-4x
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