Math practice for 13 year olds - page 323 of 423
Number of problems found: 8459
- Difference 4319
I think two numbers. Their sum is 36, and their difference is 14. What are the numbers? - Sharpeners 4318
Pavel bought three pencils and a sharpener in a stationery store and paid 29 CZK. Jane ordered two pencils and two sharpeners, and her purchase price was CZK 46. How much cheaper is a pencil than a sharpener? - Two friends
Two friends met as a good man perished together for a beer. After recovering the most important topics (politics, women, football ...), one asks: - And how many children do you have? - I have three children. - And how many years have you? A friend already - One percent
One percent of all the lights in the city are LED, and the remaining 99% are conventional. Other types are not there. John counted them honestly, but he had counted only conventional. After a good dinner, he registered numbers, and he gave notice that fro - Probably member
Look at the series 2,6,25,96,285, ? What number should come next? - Rainfall
The annual average rainfall in India was 26 461 mm in Cherrapunji in 1981. How many hectoliters of water fell on one square meter? Would you fit this amount of water into a cube of three meters? - Equilateral 4301
Triangle ABC is equilateral with a side length of 8 cm. Points D, E, and F are the sides AB, BC, and AC midpoints. Calculate the area of triangle DEF. In what ratio is the area of triangle ABC to the area of triangle DEF? - Capacity 4296
The hotel's capacity is, in total, 30 quiet rooms. Double rooms are x. The rest are triples. Express in terms of the maximum number of guests. - Cuboid - ratios
The sizes of the edges of the cuboid are in the ratio of 2:3:5. The smallest wall has an area of 54 cm². Calculate the surface area and volume of this cuboid. - Originally 4292
The weight of the water container is 2.48 kg. If we pour 75% of the water, the container with water weighs 0.98 kg. Find the weight of the empty container. How much water was originally in the container? - Wednesday 4286
During the flu epidemic, 10% of the school's students fell ill on Monday, another 39 on Tuesday, and one-eighth of all the school's students joined them on Wednesday. During these three days, one-third of all school pupils fell ill. How many students does - Circumference 4285
Calculate the circumference of a rhombus, one side of which is 6 cm long, and the height of this side is 2 cm long. The height on the other side is 4 cm long. - Solution 4284
How many grams of table salt and water do we weigh to prepare 500 g of a 15% solution? - Wooden blocks
Alex cut the wooden block into two parts in one cut. Which body could he not get? - Unknown 4281
19% of the unknown number is 12, less than 23% of the same number. Specify an unknown number. - Circumference 4278
An inscribed circle is also described as an equilateral triangle with a side length of 8 cm. How many cm is the circumference of the inscribed circle smaller than the circumference of the described circle? - Rectangle diagonals
It is given a rectangle with an area of 24 cm² and a circumference of 20 cm. The length of one side is 2 cm larger than the length of the second side. Calculate the length of the diagonal. Length and width are yet expressed in natural numbers. - Hypotenuse
Calculate the length of the hypotenuse of a right triangle if the length of one leg is 4 cm and its area is 16 square centimeters. - Remaining 4262
Owl Wesley read the book for three days. On the first day, she read one-fifth of the pages. On the second day, she read half of the remaining and the last 30 pages on the third day. How many pages did the whole book have? - Determine 4258
Determine the length of the side of the diamond, with its two diagonals being 12 cm and 6 cm long.
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