Math practice for 13 year olds - page 286 of 428

Number of problems found: 8552

Rhombus 29
One of the diagonals of a rhombus is equal to a side of the rhombus. Find the angles of the rhombus.
Cube - surface and volume
How many times does the volume of a cube increase if its surface increases four times?
Two brothers
Two brothers want to collect 20 kg of chestnuts. If only Marek collected, he would make it in 30 minutes. It would take Milan 10 minutes longer. How long after Mark does Milan have to start collecting to be finished in 18 minutes?
Three-Day Hike Distances
Jonas and Vojta went on a three-day hike on Friday. On the first day, they covered a fifth of the total route, on Saturday three-quarters of the challenging route, and had 20 km left for Sunday. What percentage of the total route did the boys cover in the
Diagonal to area
Calculate the area of a rectangle in which the diagonal length is 10 cm.
Ratio of Two Numbers
Fifty percent of the number x equals sixty percent of the number y. What is the ratio of the numbers x and y?
Exercise creation
Three lecturers will create 75 tasks in two and a half days. In how many days will it take at least five lecturers to create enough exercises for the exercise book, which should contain 300 exercises? (we assume that all tutors are equally efficient and w
Fractions Comparison Times Larger
How many times are the three halves larger than eighty percent of the three quarters?
Painters
Six of the painters paint 90 m of the fence in five hours. For how long would the four painters paint a 45-meter fence? How many meters of the fence were painted by painters 5 for two hours?
13 tickets
A short and long sightseeing tour is possible at the castle. A ticket for a short sightseeing circuit costs CZK 60, for a long touring circuit costs CZK 100. So far, 13 tickets have been sold for 1140 CZK. How much did you pay for tickets for a short tour
Aunt Niece Age Puzzle
Soňa and her aunt have a birthday, and her aunt is five times older than Soňa. When Soňa is a year younger than her aunt, her aunt will be eighty years old. How old is Sona now?
Girls
The children's competition was attended by 63 girls, which is 30% of all children's participants. How many children attended this competition?
Perimeter of a rectangle
If the perimeter of a rectangle is 114 meters and the length is twice the width plus 6 meters, what are the length and width?
Cuboid
The sum of the lengths of the three edges of the cuboid that originate from one vertex is 210 cm. The edge length ratio is 7:5:3. Calculate the length of the edges.
Playing
How long have we trained on the pitch when we know that the warm-up took 10 minutes, we trained passes for one-third of the time, and we played football half the time?
Test Score Percentage
The natural history test contained 21 questions. The teacher evaluated each question by two points. Milan wrote a test for 39 points. At what percentage was Milan successful?
Grammar School Admission
One hundred fifteen girls and 136 boys enrolled in a specific grammar school. They admitted 64 students. What percentage of the total students enrolled in grammar school?
Examples Solved Percentage
Zuzka planned to recalculate 20 examples from the new collection during the holidays, but she only managed to calculate 13 of them. At what percentage did she fulfill her plan?
Visiting Cities Order Ways
The tourist group wanted to visit the four Slovak cities: Bratislava, Banská Bystrica, Ružomberok, and Levice. They decided that Levice would be the third place they would visit. How many different ways could they organize their city visit program?
Percentage Two Hours Minutes
How many minutes is 60% of two hours?

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