Math practice for 13 year olds - page 213 of 424

Number of problems found: 8476

Transported 20543
How many cars will the dirt be transported in an excavation 10 m long, 11 m deep, and 70 cm wide if the load capacity of each used car is 2 tons? The clay density is 1,800 kg/m².
Interested 20533
About an eighth of the 9th-grade students are interested in studying at the academy, about a sixth at the gymnasium, one quarter at the SOU, one-third at the vocational school, and 3 students at art schools. How many pupils are there in the class?
Secondary school
In 2015, there were 1140000 primary and secondary school pupils in the Czech Republic, 15.6% of whom attended private schools. How many students attended private schools?
Dimensions 20513
The sides of the rectangle are 6.6 cm and 4.2 cm. We change its dimensions in a ratio of 5:2. How many times does the rectangle's area change compared to the original rectangle?
Calculate 20503
Calculate how many% of students do homework. If there are 16 students in the class, only 8 give them up.
Distance 20493
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?
Travels 20483
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?
Motorcyclist 20473
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?
Proportion 20443
On line AB, 15 cm long, point C lies 4 cm from point A. In what proportion does this point divide the line AB?
Roofers 20413
Three roofers put the roofing on the roof in 8 days. How long will it take to get two more after three days?
Increased 20383
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?
Divided 20373
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?
Length 20353
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
Timetable 20313
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 20233
How much percent performance improvement is needed if the work we have planned for five days has to be managed in three days?
Staircase 20203
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?

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