Math practice for 13 year olds - page 179 of 414
Number of problems found: 8280
- Barrel water
The cylindrical barrel is 1.2 m high, and the diameter of its base is 0.6 m. How many hectoliters of water will fit in the barrel? What is the smallest amount of sheet metal needed for its production? (we count both bases) - Pentagonal pyramid
The height of a regular pentagonal pyramid is as long as the edge of the base, 20 cm. Calculate the volume and surface area of the pyramid. - The soup pot
The soup pot is shaped like a cylinder with a bottom diameter of 30 cm and a height of 36 cm. How many people is the soup enough if the pot is filled to ¾ height? It is calculated with 0.25 l of soup for one person. - Right isosceles triangle
What can be the area of a right isosceles triangle with a side length of 8 cm? - Earning 2
Rahul earns 5000 Rs, and he saves 500 Rs. What percentage of his earnings does he save? - Headphones
Charlie is saving money to buy a pair of headphones for $225. He has $37 so far and can save $15 per week. In how many weeks will he have enough money to buy the headphones? - How many 9
How much percent volume remains of a sphere if the diameter decrease 3×? - Flower petal
We have 30 flowers, and each one has three or four petals. They have a total of 102 chips. How many flowers have four petals? Z represents the number of flowers with 4 petals. Choose the expression that determines the number of flowers with 3 petals. - Wholesale vs retail
For books, retail adds 10% of the wholesale price of the goods. If the book costs 4.80 euros wholesale, how much will it cost in retail? - Ratio in trapezium
The ratio of the height v and the base a, c in the trapezoid ABCD is 1:6:3. Its area is 324 square cm, and the peak angle B is 35 degrees. Determine the perimeter of the trapezoid. - Free fall
How long and at what speed does the body fall to the ground during a free fall from a height of 35 m? - The average height
The average height of six friends is 181 cm. Peter came among them, which reduced the average height by 2 cm. Calculate Peter's height. - Salt solution preparation
Prepare 2 liters (kg) of a 3% salt solution in water. - Hydrogen peroxide solution
Prepare 250 g of a 30% solution of hydrogen peroxide in water. - Salicylic acid solution
Prepare 600 g of an 8% solution of salicylic acid. - Blue rock solution Prepare 100 g of a 15% blue rock solution.
- Odd number creation
How many odd three-digit numbers can you make of the five cards with the numbers 1, 2, 3, 5, and 6? - Plane distance
Two planes took off from Prague at one point. The first is flying north at a speed of 420 km/h, and the second is flying east at a speed of 560 km/h. How far apart will they be as the crow flies in 25 minutes of flight? - Regular 4-sided pyramid
Find the area (surface area) of a regular 4-sided pyramid if its height is 20 m and the wall height is 23 m. - Clock hand distance
How far apart are the tips of the clock's hands in 3 hours if the larger hand is 124 mm long and the smaller 75 mm?
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