Math practice for 13 year olds - page 239 of 428
Number of problems found: 8556
- Clock quadrilateral angle
Calculate the magnitude of the largest inner angle and the deviation of the diagonals in the quadrilateral, whose vertices correspond to points 1, 5, 8, and 12 on the dial. - Ratio of sides
Calculate the area of a circle with the same circumference as the circumference of the rectangle inscribed with a circle with a radius of r 9 cm so that its sides are in a ratio of 2 to 7. - Temperature difference 2
The temperature in London on New Year's Day is -2 degrees Celsius. The temperature in Prague on the same day is -14 degrees Celsius. What is the temperature difference between the two cities? - A kite
ABCD is a kite. Angle OBC = 20° and angle OCD = 35°. O is the intersection of diagonals. Find angle ABC, angle ADC, and angle BAD. - Two cubes
The surfaces of two cubes, one of which has an edge of 22 cm longer than the second, differ by 19272 cm². Calculate the edge length of both cubes. - Rectangular trapezoid
In a rectangular trapezoid ABCD with right angles at vertices A and D with sides a = 12cm, b = 13cm, c = 7cm. Find the angles beta and gamma and height v. - Cyclist Motorcyclist Meeting Time
The distance from point A to point B is 40 km. And a cyclist left at 9:00 a.m. at a speed of 20 km/h. At 9:30 a.m., a motorcyclist drove against him from place B at 40 km/h. At what time and at what distance from A do they meet? - Sphere VS
Find the surface and volume of a sphere with a radius of 2 dm. - Cyclist Car Catch Distance
The cyclist left place A at 8:00 a.m. at a constant speed of 25 km/h. At 8:30, a passenger car leaves A at a speed of 75 km/h along the same route. How many kilometers does the cyclist travel before the car catches up with him? - Balls Color Probability Minimum
The bag has five red, four blue, and seven white balls. At least how many balls do we have to pull out to have at least one white ball on the table? - Four-digit numbers
The numbers 1,2,3,4,5 are given. Role: a) how many 4-digit numbers can we create if the digits cannot be repeated? b) how many generated numbers will not contain the digit 1? c) How many of the generated numbers will be divisible by 5? d) How many of the - A sculptor
A sculptor is duplicating a statue based on an original statue. If the scale factor of the replication is 3.2, will the new statue be larger or smaller than the original statue (enter 1 = larger, 0= smaller) - Trip kilometers
The route of the tourist trip measures 28 cm on a map with a scale of 1:50000. The average walking speed is 4km/h. How many kilometers does the trip measure? How many hours will the students spend on the trip? - Summerjob
Temporary workers Franta ties a sheaf of hay in 20 minutes, Lojza only a quarter in the same time. How many sheaves do they tie together in 8 hours? - Square perimeter calculation
Calculate the perimeter of a square containing 9 acres. - The railway
The railway line has a gradient of 12 per mille. How many meters will it ascend to a horizontal distance of 4 km? - Six workers
Six workers planned to repair the roof in 5 days. After two days, two workers get sick. How long will the remaining workers complete the roof at the same rate? - Competition Prize Places
How many ways can you be rewarded in the 1st, 2nd, or 3rd place? What is the prize for 15 participants in the competition? - One three
We throw two dice. What is the probability that number three falls maximally once? - Telephone numbers
How many 7-digit telephone numbers can we put together so that each number consists of different digits?
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