Reason - practice for 13 year olds
Number of problems found: 794
- Two-element combinations
Write all two-element combinations from elements a, b, c, and d. - Identical 20963
In which triangles is the line identical with the height? - Three-digit
How many do three-digit natural numbers not have the number 7? - Is right triangle
Decide if the triangle XYZ is rectangular: x = 4 m, y = 6 m, z = 4 m - N-gon angles
What is the sum of interior angles 8-gon? What is the internal angle of a regular convex 8-polygon? - Arithmetic 40671
The number 20 is the arithmetic mean of the eight numbers. Determine their sum. - Magnitude of angle
What magnitude has an obtuse angle enclosed by the hands of clocks at 12:20 hours? - Rhombus 29
One of the diagonals of a rhombus is equal to a side of the rhombus. Find the angles of the rhombus. - Continuation 46483
Continuation of the number series 9,12,18,27 - Calculate 14733
Square has the side a = 12 cm. Calculate the area of a triangle in the square. - Five-digit 13361
Write the 12 largest five-digit numbers in the twelve-position system and the 12 smallest six-digit numbers. - Seven
Seven friends agreed to send everyone a holiday card. How many postcards were sent? - Unknown numbers
The sum of two consecutive natural numbers and their triple is 92. Find these numbers. - Probability 81678
What is the probability of guessing a PIN code (4 numbers) if it contains only even numbers? - Probability 81446
What is the probability that each digit is different in a five-digit number? - Determine 69304
Determine the size of the ACF angle in the regular ABCDEF hexagon. - Center-symmetric 58201
Find out which we can write letters (uppercase) as center-symmetric. - Isosceles 5856
How many isosceles triangles form in a square when we mark all diagonals? - Summands
Find two summands of the number 42 so that its product is minimized. - Coins
On coins found was stated that from the year 87 BC. Is it right?
Do you have homework that you need help solving? Ask a question, and we will try to solve it.