Math practice for 13 year olds - page 128 of 415
Number of problems found: 8285
- 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 Lea 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? - Similar triangle area
The ABC triangle has a circumference of 11 cm. Triangle A'B'C ', similar to triangle ABC, has side lengths of 6 cm, 120 mm, and 1.5 dm larger than triangle ABC. Calculate the area of the triangle A'B'C '. - Triangle circle length
A right-angled triangle ABC with sides 5 cm and 12 cm is described by circle k. Calculate the length of circle k in centimeters. When calculating, use π = 3, 14 and round the result to tenths. - Poultry farm geese
Together, they keep 110 poultry (hens, turkeys, ducks, and geese) on the farm. Hens represent half. There are ten turkeys and seven ducks, more than geese. How many geese are kept on the farm? - Drawing scale length
What is the actual length of the product in cm, which is 8 cm long on a 5:2 scale technical drawing? - Represented
The children of class 5 A wrote a maths test. The class had 29 children. After marking, there were two more grade 1 s than grade 5 s; grade 3 occurred three times; grade 2 represented twice the number of grade 1 s; grade 4 did not occur. How many students - Deposit
At the beginning of the year, Michael's father opened a bank account in which he deposited 1,800 euros. At the end of the year, he had 1,845 euros in his bank account. What was the annual interest rate in percent? - Tree street spacing
Eleven trees are planted on the street at equal distances. If they planted three more trees, the spaces between them would be 12 m shorter. What is the distance in meters between the first and the last tree? - Probability
Two duelists have agreed to meet at a designated location between 6:00 and 7:20. One of them will wait 8 minutes after arriving and then leave. The other will wait for his opponent for 16 minutes and then leave. What is the probability that the duel will - Cube edges length
If we reduce the length of the cube edge by 30%, this reduced cube has an area of 1176 cm². Specify the edge length and volume of the original cube. - Class height average
In the 8 A class, the average height of 12 girls is 156 cm, and the average height of 14 boys is 172 cm. Calculate the average number of students in 8 A. - Pipe water percentage
Through the first pipe, 90 hl of water flows into the tank per hour, and 2.7 l of water per second through the second pipe. Calculate by what percentage more or less water flows per unit time into the tank through the second pipe than through the first pi - Coin crown savings
Petra has two-crown and five-crown coins. He has ten coins in the coffers. How many two crowns and five crowns if she saved CZK 29? - Diamond diagonal area
The KLMN diamond has a circumference of 32 cm, and the intersection of its diagonals is 3 cm away from the LM side. What is the area of the diamond?
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