Reason - 8th grade (13y) - math problems
Number of problems found: 473
Seven friends agree to send everyone a holiday card. How many postcards were sent?
On coins found was stated that from the year 87 BC. It is right?
- One three
We throw two dice. What is the probability that max one three falls?
They have together 39 years - he has 2 times as she was when he was equal as she has today ....
- Two integers
Two integers, a and b, have a product of 36. What is the least possible sum of a and b?
How probable is a randomly selected three-digit number divisible by five or seven?
Write all the integers x divisible by seven and eight at the same time for which the following applies: 100
Place one pair of brackets in expression 20-16 + 10 - 4 - 2 so that the result will be 0.
How many different ways can initiate a game of chess (first pass)?
- The dice
What is the probability of events that if we throw a dice is rolled less than 6?
- Two-element combinations
Write all two-element combinations from elements a, b, c, d.
From the colors - red, blue, green, black and white, create all possible tricolors.
- Probably member
Look at the series 2,6,25,96,285, ? What number should come next?
Susan is 3 years and as she will be old as Teodor now him will be 11. How old is Teodor today?
- Marriage sttus
In our city, there are 3/5 of the women married to 2/3 of the men. Find what part of the population is free.
- Combinations of sweaters
I have 4 sweaters two are white, 1 red and 1 green. How many ways can this done?
- Three ints
The sum of three consecutive integers is 2016. What numbers are they?
- Two ages
Gabrielle is 9 years younger than Mikhail. The sum of their ages is 87. What is Mikhail's age?
Mom is 42 years old and her daughters 13 and 19. After how many years will mother as old as her daughter together?
Andrew wrote this series of numbers: 1,3,7,15, .... n. Which number in the series does not belong? ?