Maths practice for 12-year-olds - page 180 of 360
Number of problems found: 7200
- Drying
The raw wood beam weighs 85 kg. It is calculated that drying will reduce its weight in a ratio of 5:6. What will be the weight of this beam after drying? - Reconstruction 23531
The enclosure for lions in the ZOO has a rectangular shape with a length of 5.6m and a width of 6.8m. During the reconstruction, the length of the fence must be adjusted to 5.2 m so that the size (areas) of the paddock stays the same. What will be the wid - Cutting the prism
A prism with a square base with an area of 1 cm² and a height of 3 cm was cut from a cube with an edge length of 3 cm. What is the body's surface formed from the cube after cutting the prism? - Tourist route
How long is the tourist route when tourists cross four-sevenths of the way on foot, cross the bus twice less than on foot, and pass the last 14 kilometers by boat? - Tram stop
The blue tram stops every 12 minutes, and the red one stops for 8 minutes. At 8 o'clock, they left the stop together. How many times do they meet at a stop before 11 AM? - Identical cubes
From the smallest number of identical cubes whose edge length is expressed by a natural number, can we build a block with dimensions 12dm x 16dm x 20dm? - Interior angles
Calculate the interior angles of a triangle that are in the ratio 2:3:4.
- Largest squares
How many of the largest square sheets did the plumber cut the honeycomb from 16 dm and 96 dm? - Dimensions 23321
The main swimming pool has a bottom paved with square tiles with a side of 15 cm. How many tiles lie at the bottom of the pool? (pool dimensions are 50m long and 25m wide. Water depth 1.6m) - Cone base
Calculate the circumference of the cone base; round the result to millimeters. If you know: radius 24 mm and height 46 mm. - Measuring 23281
We have a box with dimensions of 20cm, 16cm, and 8cm. How many cubes can fit in it if the cube has a size of 4cm? - Consecutive 23251
Find the LCM of four consecutive natural numbers. Its sum is 42. - The farmer
The farmer calculated that the supply of fodder for his 20 cows was enough for 60 days. He decided to sell two cows and a third of the feed. How long will feed the rest of the peasant's herd last? - Calculated 23231
There are 80 screws in the box with a total weight of 1.24 kg. The weight of one screw weighs 400g. Screw weight calculated in grams - Rectangular 23181
How many steps does a person mow a rectangular football stadium around its perimeter? The dimensions of the stadium are 100 m and 50 meters. The length of a person's stride is 75 cm.
- The hollow cylinder
The hollow cylinder has a height of 70 cm, an outer diameter of 180 cm, and an inner diameter of 120 cm. What is the body's surface, including the area inside the cavity? - Cube-shaped 23041
A pint of sugar weighs 800 g. How many tons of sugar will fit in a 100cm cube-shaped box? - Calculate 23031 The pool has sides of 5m and 2m, and the water level is 100 hl. Calculate the height of the water in the pool.
- Brownies Mrs. Merritt made brownies, and the recipe had to be cut in 1/2. The recipe called for 2 5/8 cups of sugar. How much sugar did she use?
- Originally 22951
The tank originally had 7 m³ of gasoline. We gradually pumped out 3hl, 3000dm3, and 700 liters of gasoline. How many liters of petrol is left in the tank?
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