Math practice for 13 year olds - page 124 of 428

Number of problems found: 8558

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?
Two-digit number creation
How many natural two-digit numbers can we form from the digits 0, 1, 2, and 3 if the numerals cannot be repeated in these numbers?
Hector
Hector has 3/4 hours to spend completing his homework. He wants to spend 1/3 of his time on math homework, 10 minutes on reading homework, and the remaining time on science homework. How much time, in minutes, does he have to spend on his SCIENCE homework
Ladder wall length
A ladder leans against the wall. It touches the wall at the height of 340 cm, and its lower end is 160 cm away from the wall. How long is the ladder? Express the result to the nearest centimeter.
Company employee percentage
The company employs 20% more women than men and 240 women. How many employees are there?
Worker earnings ratio
Temporary workers Ivan, Lea, and Dana earned a total of 480 euros. Ivan made a third of that money. Lea and Dana earned the remaining money in a 3:1 ratio. How many euros did Leo earn?
Worker addition hours
Six workers will do the work in 8 hours. How many workers must be added if the work is to be completed in 3 hours?
Line ratio division
The line is divided into two parts in a ratio of 4:7. The difference in lengths of individual parts is 18 cm. What is the length of the line in cm?

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