Divisibility + reason - practice problems
Number of problems found: 159
- What is 20
What is the least number that should be added to 2497 so that the sum of the digits is divisible by 5,6,10
- Three-digit 69114
How many three-digit numbers have a digit sum of 6? Write the ratio of the number of created even and odd numbers and adjust it to the basic form.
- Two-digit 68654
List all compound positive two-digit numbers whose greatest common divisor with the number 51 is the number 17.
- Divisible 68644
List all divisible numbers by six and seven and are greater than 79 and less than 91.
- Three-digit 66854
How many three-digit numbers with a digit sum of 9, in which no digit can repeat?
- Expression 66754
Find the largest natural number n for which the value of the expression (37-2n) / 3 is equal to the natural number.
- Find two digits
Find the possible values of A and B if the 6 digit number 2A16B6 is divisible by 4 and 9. Result write as composed number.
- How many
How many double-digit numbers divided by nine give the rest of the seven?
- Even five-digit
How many even five-digit natural numbers with different digits can be created from the digits 0 - 6?
One always remained when dividing the tangerines into packages of 8 or 10. How many were there if more than 250 and less than 300?
- Three-digit 56441
Determine the number of all natural three-digit numbers divisible by 9, consisting of the numbers 0, 1, 2, 5, 7:
- Lcm = 22 + gcd
The least common multiple of two numbers is 22 more than their greatest common divisor. Find these numbers.
- Directly 55591
If n is a natural number that gives a division of 2 or 3 when divided by 5, then n gives a residue of 4 when divided by 5. Prove directly
- Four-digit 55481
Find all four-digit abcd numbers to which: abcd = 20. ab + 16. cd, where ab and cd are double digits numbers from digits a, b, c, and d.
- Consecutive 47011
The sum of two consecutive odd numbers is 184. What are these numbers?
- We roll
We roll two dice A. - what is the probability that the sum of the falling numbers is at most 4 B. - is at least 10 C. - is divisible by 5?
- Probability 42081
What is the probability of any two-digit natural number a) is divisible by seven, b) is divisible by nine, c) is not divisible by five.
- Five-digit number
Anna thinks of a five-digit number that is not divisible by three or four. If he increments each digit by one, it gets a five-digit number that is divisible by three. If he reduces each digit by one, he gets a five-digit number divisible by four. If it sw
The three friends divided the balls in a ratio of 6: 5: 4. Some two of them got a total of 126 balls. How many balls were there together?
- Coloured numbers
Mussel wrote four different natural numbers with coloured markers: red, blue, green and yellow. When the red number divides by blue, it gets the green number as an incomplete proportion, and yellow represents the remainder after this division. When it div
Divisibility - practice problems. Reason - practice problems.