# 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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