Math practice for 13 year olds - page 124 of 428
Number of problems found: 8555
- Cyclist stage speed
In the first stage, the cyclist covered 70 km at a speed of 22.1 km/h. In the second stage, he covered 40 km (a total of 110 km), and his average speed increased to 22.9 km/h. What an average speed he developed in the second stage! - Two-digit same digits
What probability does a randomly drawn two-digit number have the same digits? Write the result as a decimal number. - Shape area order
Arrange the given shapes according to their area, in descending order: S - Square with perimeter = 16 cm O - A rectangle with side a = 3 cm and perimeter o = 16 cm T - A right-angled triangle with a hypotenuse of 4.125 cm and a hypotenuse of 8.125 cm - Goods season price
Goods with a price of 520 € became more expensive by 15% at the beginning of the season. At the end of the season, the goods became cheaper by 10%. How much did the goods cost at the end of the season? - Cuboid - block
The base of the block is a square with an area of 16 cm². The surface of the block is 128 cm². You calculate the volume of the block in cm³. - Triangle circle radius
Calculate the circle radius circumscribed by a right triangle whose perpendiculars are 10 cm and 24 cm long. - Pool inlet filling
We can fill the pool with two inflow pipes. The first pipe fill in 24 hours and the second in 16 hours. How long did the pool fill if the first tube was open for the first 4 hours and then we opened both inlets? - Four-digit number shift
Writing a four-digit number ends with the number 5. If we move this number to the first place, we get a number 531 larger than the original. Specify the original number. - Scout brigade total
A group of scouts works in the woods. A third of them cleaned the stream. A quarter collected timber, and the remaining ten planted trees. How many scouts were on the brigade? - Coal dome days
There are 12,000 tons of coal on the first dome and 2,200 tons on the second. They take 80 tons from the first kick every day and 60 tons from the second. How many days will the same amount of coal be on both kicks? - Probability RGB
The bag has six red, five green, eight blue, and 11 yellow balls. What is the probability that we will pull out a green ball? - Linden shadow height
The length of the linden shadow is 429 cm. The length of the shadow meter is 78cm. Calculate the height of the linden. - Trash volume estimate
In physics class, students estimated the volume of the trash can in the classroom. There is a record of the answers of 20 pupils on the board. The actual volume of this dustbin was 12 liters. By how many liters does the average student estimate differ fro - Parallelogram perimeter area
The parallelogram has side a = 58cm and diagonals u = 89cm and v = 52cm. Calculate the perimeter and area of this parallelogram. - Trapezoid triangle area
In the triangle, ABC, X, and Y are the centers of the sides BC and CA, respectively. The ABXY trapezoid has an area of 12. Calculate the area of triangle ABC. - Machine product hours
The machine will produce 5,600 products in 7 hours. How many products will they make in 8 hours? - Missing denominator 3 1/3 + 4/? =4 2/15 What is the missing number in the equation?
- Delivery scrap percentage
In the first delivery of 120 parts, there was 5% waste. In the second delivery in which, 10% of the 80 were scrapped. How much scrap was brought in with the first and second deliveries combined? What % of scrap was there in both deliveries of parts, out o - Library book increase
The number of books in the city library increased by 0.2% in 2008 and 0.6% in 2009. At the same time, the total number of books remained less than 300,000. How many books were added to the city library in 2009? - Dining room lineup
If the boys let the two girls in front of them, how many different ways can Anka, Betka, Cyril, Daniel, and Erik line up in the dining room?
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