Reason - practice for 13 year olds - page 2 of 40
Number of problems found: 794
- Divisors
The sum of all divisors unknown odd number is 2112. Determine the sum of all divisors of a number that is twice unknown numbers. - Secret number
Find the secret number n, which reversed decreases by 16.4 if the number increases by 16.4. - Two dice
We roll two dice. What is the probability that the sum of the falling numbers is greater than 3? - Mysterious area
The trapezoid ABCD is given. Calculate its area if the area of the DBC triangle is 27 cm². - Sum and ratio
The sum and ratio of two numbers are equal to 10. Which numbers are they? - Chocolates
How many ways can we distribute eight different chocolates to four children? - Digit sum
How many are three-digit numbers that have a digit sum of 6? - Subsets
How many 19 element subsets can be made from the 26 element set? - Christmas Day
In leap years was 53 Sundays. On what day of the week fell Christmas Day? - Log
The worker cut his thick log into six pieces for 30 min. How long did he cut the log to 12 pieces? - Groups 72194
I have eight groups. How could they place first, second, and third? - Consecutive 29761
Determine three consecutive natural numbers, the sum of which is 66. - Significant 19983
We roll two dice, red and green. What probability will a more significant number fall on the red dice than on the green? - Numbers 7755
How many digits 7 are in numbers from 1 to 777? - Divisors 6619
Which natural number less than 100 has the largest number of divisors? - Gold, silver, bronze
How many ways can we divide gold, silver, and bronze medals if six people compete? - AM of three numbers
The number 2010 can be written as the sum of 3 consecutive natural numbers. Determine the arithmetic mean of these numbers. - Letters
ABC + DEF = GHIJ replace letters with numbers so that the sum is correct (different letters = different numbers) - Diofant equation
250x + 120y = 5640 - Test points
If you earned 80% of the possible 40 points, how many points did you miss to get 100%?
Do you have homework that you need help solving? Ask a question, and we will try to solve it.