Reason - 8th grade (13y) - math problems
Number of problems found: 489
- Seven
Seven friends agree to send everyone a holiday card. How many postcards were sent?
- Tricolors
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.
- Probability
How probable is a randomly selected three-digit number divisible by five or seven?
- Chess
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?
- Subsets
How many 19 element's subsets can be made from the 26 element set?
- Algebrogram
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?
- Coins
On coins found was stated that from the year 87 BC. It is right?
- Summands
Find two summands of the number 42, so that its product is minimized.
- Three-digit
How many do three-digit natural numbers not have the number 7?
- Progression
-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?
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