Reason - 8th grade (13y) - math problems
Number of problems found: 489
Seven friends agree to send everyone a holiday card. How many postcards were sent?
From the colors - red, blue, green, black and white, create all possible tricolors.
- Two-element combinations
Write all two-element combinations from elements a, b, c, d.
How probable is a randomly selected three-digit number divisible by five or seven?
How many different ways can initiate a game of chess (first pass)?
- Diofant equation
250x + 120y = 5640
- One three
We throw two dice. What is the probability that max one three falls?
How many 19 element's subsets can be made from the 26 element set?
Solve algebrogram: mama+anna=vari How many solutions are?
- The dice
What is the probability of events that if we throw a dice is rolled less than 6?
On coins found was stated that from the year 87 BC. It is right?
Find two summands of the number 42, so that its product is minimized.
How many do three-digit natural numbers not have the number 7?
-12, 60, -300,1500 need next 2 numbers of pattern
- Christmas Day
In leap years was 53 Sundays. On what day of the week fell to Christmas Day?
- Hexagon = 8 parts
Divide the regular hexagon into eight equal parts.
- Rhombus 29
One of the diagonals of a rhombus is equal to a side of the rhombus. Find the angles of the rhombus.
- Digit sum
How many are three-digit numbers that have a digit sum of 6?
- Hockey match
The hockey match ended with result 3:1. How many different storylines may have the match?
- Gold, silver, bronze
How many ways can we divide gold, silver, bronze medails if there are 6 people competing?
Reason - math problems. Examples for 8th grade.