Math practice for 13 year olds - page 207 of 428
Number of problems found: 8556
- Prism volume calculation
The prism with a diamond base has one base diagonal of 20 cm and a base edge of 26 cm. The edge of the base is 2:3 to the height of the prism. Calculate the volume of the prism. - Unknown number percentage
27% of the unknown number is 12 fewer than 33% of the same number. Find an unknown number. - Gold, silver, bronze
How many ways can we divide gold, silver, and bronze medals if six people compete? - Interior angles
Calculate the interior angles of a triangle that are in the ratio 2:3:4. - Goalkeeper shot success
The goalkeeper caught 188 shots during the tournament and achieved a success rate of 94%. How many shots per goal ended up in the net? - The cube
The cube and cylinder weigh the same as three 20-gram weights. Three cubes and one cylinder weigh the same as two cylinders and one cube. How many grams does one cube weigh (and one cylinder)? - IPhone eshop
An e-shop employee has lost some sales records and cannot now calculate the ratio by which the number of iPhones sold increased compared to last year. Help him calculate the ratio, knowing that the ratio of the number of iPhones sold and the ratio of the - Cone hat paper
For his birthday, Jirka made a cone-shaped hat out of paper. The side of this cone is 35cm long, and the radius of its base is 20cm. How much dm of paper did Jirka use to make it? Thank you - Cone base
Calculate the circumference of the cone base; round the result to millimeters. If you know: radius 24 mm and height 46 mm. - Box and cubes
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? - Triangle angle calculation
In an isosceles triangle, the angle at the primary vertex is 20 ° smaller than twice the magnitude of the angle at the base. What are the interior angles of a triangle? - The angles The angles in the triangle are in the ratio 12:15:9. Find the angles.
- 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? - Screw weight calculation
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 - Defective product standard
The factory sets a standard that 2% of products may be defective. Last week, out of 1,250 products, 32 were defective. How many defective products were the standard exceeded? - Lenka Lukas age
Lenka is three times younger than her brother Lukas; they are 20 years old. How old is Lenka, and how many are Lukas? - Garden raking time
Karel would rake the leaves in the garden alone in 24 minutes. His younger brother would take 30 minutes. How long would they dig a garden if Karel digs alone for 6 minutes and his brother comes to his aid? - The manufacturer
The manufacturer found that 3% of the plates produced had a malfunction. Of the complaint, 75% are first and 25% second. What is the probability of producing first and second-class plates? - Academy girl calculation
There are 180 pupils in the first year of the academy. Seven girls for every five boys, so there are how many girls in the year? - Probability
How probable is a randomly selected three-digit number divisible by five or seven?
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