Math practice for 13 year olds - page 214 of 428
Number of problems found: 8556
- Homework completion percentage
Calculate how many% of students do homework. If there are 16 students in the class, only 8 give them up. - Snail ant meeting
A snail emerges from the leaf at a speed of 1 cm/min. At the same time, an ant rushes towards it from the stone at a speed of 5 cm/min. The distance between the leaf and the stone is 1.2 meters. How soon will they meet, and at what distance? - Car meeting calculation
When and where will the two cars that drove at the same time from cities A and B 90 km apart if the car from city A travels at a speed of 75 km/h and the car from city B at a speed of 60 km/h meet? - Cyclist motorcyclist meeting
The cyclist leaves place A at a speed of 25 km/h. A motorcyclist rides against him at a speed of 55 km/h. The distance between places A and B is 60 km. When and where do I meet? - Line proportion calculation
On line AB, 15 cm long, point C lies 4 cm from point A. In what proportion does this point divide the line AB? - Roofer work completion
Three roofers put the roofing on the roof in 8 days. How long will it take to get two more after three days? - Bucket volume increase
We threw a prism with the base of a right triangle with squares 15 × 10 cm and a prism height of 1.5 dm into a 10 l bucket. How much has the volume in the bucket increased? - Line part comparison
The line AB, whose length is 24 cm, is divided in a ratio of 5:3. How much longer is its larger part? - Round flowerbed
I will make a sidewalk up to 0.5 meters wide around a round flowerbed with a diameter of 6 meters. How much gravel is needed if the layer is 5 cm high? - Line length change
The given line is MN with a length of 11 cm. Change its length in the ratio: a) k = 2:1 b) k = 1:2 c) k = 17:11 d) k = 22:33 - Train speed calculation
The train ran the distance between stations at a 90km/h speed in 4 hours. What speed can it take if the journey takes an hour longer according to the new timetable? - In the classroom There are 30 boys and a few girls in the class. In the six months, 28 boys and all girls benefited, which was 95% of all pupils. How many pupils are there in the classroom?
- Square - increase sides
If we increase the length of one pair of opposite sides of the square by 2 cm and the length of the other two sides by 1 cm, we will create a rectangle, the perimeter of which will be 10% larger than the perimeter of the original square. What is the side - Performance improvement percentage
How much percent performance improvement is needed if the work we have planned for five days has to be managed in three days? - Staircase step calculation
The staircase has 36 steps, each 20cm high. How many stairs will the same staircase have if the height of the stairs is 18cm? - Troops
The tourist group has two leaders, with an average age of 30, and several children, with an average age of 10. The total age of the group is 12. How many children are in the group? - Number average calculation
The average of the two numbers is 2.8. One number is 5. What is the second number? - Flowerbed adjustment time
Two students adjust the flower bed in 3 hours. How long will this adjustment take for the pupils if they invite four helpers? - Fire tank
1428 hl of water is filled in a block-shaped fire tank with the edges of the base 12 m and 7 m. Calculate the area of water-wetted areas. - Test point threshold
According to school regulations, a student receives an excellent grade if he achieves at least 26 points in a test with a total of 30 points. What is the minimum number of points a student must obtain in a test with a total of 50 points if the same passin
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