Divisibility - practice for 13 year olds - page 2 of 8
Number of problems found: 147
- 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. - 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. - Rectangular 54871
The arranger has at his disposal a certain number of colored targets, from which he wants to create a rectangular pattern of a flower bed. If he puts 4,5,6,8,9, or 10 targets in one row, he always has three extra targets. How many targets does it have? De
- The largest divisor
The largest number which divides 60 and 75 leaving remainders 8 and 10 respectively is: - Eights of butter
How many eights of butter (1/8 of kg = 125 g) can be stored in a box with dimensions of 4 dm, 2 dm, and 1.8 dm if an eighth of butter has dimensions of 8 cm, 5 cm, 3 cm? - What are 3
What are the two digits that, when inserted in the blank spaces, will make 234 _ _ divisible by 8? - Consecutive 47011
The sum of two consecutive odd numbers is 184. What are these numbers? - Three-digit numbers
How many are all three-digit numbers made up of digits 0,2,5,7 and are divisible by nine if the digits can be repeated?
- 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? - Numbers 42291
How many five-digit odd numbers exist? - 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 not divisible by three or four. If he increments each digit by one, it gets a five-digit number divisible by three. If he reduces each digit by one, he gets a five-digit number divisible by four. If it swaps any two digi - Probability 41101
What is the probability of a random event A that a) an even number, b) a number divisible by three, c) a number greater than six will fall on the dice roll.
- Entertainment 41081
In the entertainment lottery, they draw one number from 1 to 35. What is the probability that they will draw an odd compound number? - Together
The three friends divided the balls in a ratio of 6:5:4. Some two got 126 balls. How many balls were there together? - Coloured numbers
Mussel wrote four different natural numbers with colored 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 - All pairs
Find all pairs (m, n) of natural numbers for which is true: m s (n) = n s (m) = 70, where s(a) denotes the digit sum of the natural number a. - Prime divisors
Find 2/3 of the sum's ratio and the product of all prime divisors of the number 120.
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