0
Add your answer:
Earn +20 pts
Is 27 divisiable by all numbers?
NO, it is not divisible by all numbers. This is easy to see if you remember that 27 is an odd number and odd numbers are NOT divisible by 2. Then there is the issue that is is NOT divisible by any number greater than itself. That is a lots of numbers that don't work!
Easier way to select prime numbers?
Check if a number is divisible by 2. Then check divisibility by all odd numbers, up to the square root of the number. If it isn't divisible by any of those, your number is a prime number. For higher numbers, this method may be very slow - but you asked for EASY methods, and the faster methods are certainly not easy.
What number can be divided by 3 5 7 9?
The number 945 is divisible by 3,7,5 and 9. An easy way to determine what number is divisible by a set of numbers is to multiply all the numbers in the set.3*9*7*5=945 The LCM is 315.
What are the divisibility rules for numbers 4 6 and 8?
For 4:Are the last two digits in your number divisible by 4? If so, the number is too! For example: 358912 ends in 12 which is divisible by 4, thus so is 358912. For 6: The number must be divisible by 2 and 3. For 8: This one's not as easy, if the last 3 digits are divisible by 8, so is the entire number. Example: 6008 - The last 3 digits are divisible by 8, therefore, so is 6008.
Do you have to check if 221 is divisible by 6?
It is easy to see if 221 is divisible by 6. The number 6 is even and 221 is not. An even number cannot evenly divide an odd number . You get: 36.8333333... recurring A handy rule is: Any number is divisible by 6 if it is divisible by both 2 and 3.
Is 27 divisiable by all numbers?
NO, it is not divisible by all numbers. This is easy to see if you remember that 27 is an odd number and odd numbers are NOT divisible by 2. Then there is the issue that is is NOT divisible by any number greater than itself. That is a lots of numbers that don't work!
How do you explain that even without listing all the factors of a number it is easy to tell that they are composite numbers?
To know if a number is composite without listing its factors, you can use these rules:All numbers that end with 2, 4, 6, 8, and 0 (even numbers) are divisible by 2.If the sum of the digits in a number is divisible by 3, the number is divisible by 3.If the last two digits are divisible by 4, the number is divisible by 4.All numbers that have 5 in the one's place are divisible by 5.If a number is divisible by 2 AND is divisible by 3, it is divisible by 6.If the last 3 digits of a number are divisible by 8, the number is divisible by 8.If the sum of the digits of number is divisible by 9, the number is divisible by 9.If a number ends wuth 0, the number is divisible by 10.
Easier way to select prime numbers?
Check if a number is divisible by 2. Then check divisibility by all odd numbers, up to the square root of the number. If it isn't divisible by any of those, your number is a prime number. For higher numbers, this method may be very slow - but you asked for EASY methods, and the faster methods are certainly not easy.
What number is divisible by 3 and 9 over 250?
There are infinitely many such numbers. One that is easy to find is 900.
What number can be divided by 3 5 7 9?
The number 945 is divisible by 3,7,5 and 9. An easy way to determine what number is divisible by a set of numbers is to multiply all the numbers in the set.3*9*7*5=945 The LCM is 315.
What numbers are divisible by 71805?
Easy 1 and 71805
Is a number always divisible by 4 if the sum of the digits is 8?
No. 26 for instance the sum of the digits is 8 but not divisible by 4. 32 the sum of the digits is 5 but divisible by 4 The rules for some other numbers are 2 all even numbers are divisible by 2 3 The sum of the digits is divisible by 3 4 The last 2 numbers are divisible by 4 5 The number ends in a 0 or 5 6 The sum of the digits is divisible by 3 and is even 7 no easy method 8 The last 3 numbers are divisible by 8 9 The sum of the digits is divisible by 9
How do know a number is divisible by six?
It's very easy to test a number to see if it is divisible by 4 or by 9. If it passes both tests, then it is divisible by 4x9=36.To test for divisibility by 9, add the digits of the number. If the sum is divisible by 9, then the number is divisible by 9.To test for divisibility by 4, look at the last two digits. If they are a multiple of 4, then the number is divisible by 4.
Are all even numbers divisible by 4?
No. 6 is not divisible by 4. Neither is 10, 14, 18, etc. On the other hand, if a number is divisible by 4, then it is an even number. The proof is easy. Suppose the number is N = a*4 where a can be even or odd. Then N = a * 2 * 2 = (a*2) * 2. All numbers (even or odd) when multiplied by 2 give an even number, and so N is necessarily even.
What five numbers between 100 and 200 are divisible by 2 3 and 9?
108, 126, 144, 162, 180 Note: This problem is easy if you know what to do. Divisible by two just means its an even number. If a number is divisble by 9, it is also divisible by 3. Therefore you could just start at 99 and add 9 until you get numbers that are even.
What is the divisible by the number two?
This is another easy question. The number that is divisible by 2 is 4. There are others too. Any number is divisible by two if you can divide the last number of the number by two but not get a remainder. :0)
What is the divisibility rule for eight?
A number is divisible by 8 if and only if it is an integer and the last three digits make a number that is divisible by 8. A general divisibility rule for 2^n where n is an integer is to take the last n digits and if they make a number that is divisible by n then it is divisible by n.
