Math practice for 13 year olds - page 251 of 428
Number of problems found: 8557
- Pool Wall Above Water
The garden children's pool has the shape of a cylinder with a base diameter of 3.2 m and a depth of 60 cm. The water reaches 10 cm below the top edge. How many m² of the surface of the cylindrical wall of the pool is above the water? Rounds to the whole m - Plates - gold
The father bequeathed to his two sons 4 gold plates in the shape of a square, which were 1 mm thick. The side lengths of these plates were 5 cm, 10 cm, 10 cm, and 15 cm. The sons were to receive the same amount of gold. How many gold plates did each son r - Pool filling time The garden children's pool has the shape of a cylinder with a base diameter of 3.2 m and a depth of 60 cm. How many hours and minutes will it fill 10 cm below the edge of 0.5 l of water per second flows through the tributary? Round to whole minutes and wr
- Pages counting
There are pages numbered 2 to 104 in the book. How many digits have to be printed to number the pages? - Dividing a Circle
Draw a circle k, r = 4cm, and divide it into two parts in a ratio of 1:5. - Persons
Persons surveyed:100 with the result: Volleyball = 15% Baseball = 9% Sepak Takraw = 8% Pingpong = 8% Basketball = 60% Find the average of how many like Basketball and Volleyball. Would you please show your solution? - Simplify
Simplify expression - which expression is equivalent to: 3(m + 2) − 4(2m − 9) - Isosceles triangle
In an isosceles triangle, the arm's length and the length of the base are in a ratio of 3 to 5. What is the length of the arm? - Textbook page numbering
A total of 3389 digits were needed to number all the sheets of the mathematics textbook. Assume that in a book, every leaf outside the plates is numbered. How many pages does this textbook have if it is: a) single-volume b) two-volume (with both parts hav - Electric charge time
How long does it take for a 15C charge to pass through the driver's average if a 3mA current passes through the driver? - Workers - earning
Twelve workers would earn € 800 in 10 days. How many euros would 14 workers earn in 8 days? - Which
Which decimals, when subtracted, equal 3.89: a - b = 3.89 - Test Grades Distribution Students
No one got a grade worse than three. A third of the class got one, two-fifths two, and eight students had three. How many students had one or two? - Number Multiply Increase Percent
What number do we need to multiply by 20 to increase by 5% - Diameter of a cylinder
The diameter of the cylinder is 42 cm. How many times does the cylinder turn on a 66 meters long track? - Three-part novel In how many ways can seven books be stored on a shelf if there is one three-part novel to be placed side by side?
- Digit Count Numbers Sequence
How many digits 7 are in numbers from 1 to 777? - Circles Screen Appearance Rate
The monitor screen is blank. Four new wheels appear on the screen every seven seconds when the beep sounds. On the contrary, three wheels disappear from the screen every eleven seconds. If both actions should take place simultaneously, the number of circl - Grandmother
Mom walked out to visit her grandmother in a neighboring village 5km away and moved at a speed of 4km/h. An hour later, father drove down the same road at an average speed of 64km/h. 1) How long will it take to catch Mom? 2) What is the approximate distan - Practice
How many ways can you place 20 pupils in a row when starting on practice?
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