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How do you tell if a number is prime or not?
A prime number is one that has only two factors: one and itself.You can tell if a number is prime quickly by using the Laws of Divisibility:Numbers that end in 0, 2, 4, 6, and 8 are divisible by 2.If the sum of a number's digit is divisible by 3, the number itself is divisible by 3.If the last two digits of a number are divisible by 4, the number itself is divisible by 4.If a number ends in 0 or 5, it is divisible by 5.If a number is divisible by both 2 and 3, it is divisible by 6.If you double the last digit and subtract it from the rest of the number and the answer is 0 or divisible by 7, it is divisible by 7. For example, 4364: 4 doubled is 8. 436 - 8 = 424. You still cannot readily tell if the number is divisible by 7, so you can do it again: 4 doubled is 8. 42 - 8 = 34. 34 is not divisible by 7 so 436 is not divisible by 7If the last three digits of a number are divisible by 8, the number itself is divisible by 8.If the sum of the digits of a number is divisible by 9, the number itself is divisible by 9.If a number ends with 0, it is divisible by 10.If you add every other digit and then subtract the rest of the digits and the answer is 0 or is divisible by 11, the number itself is divisible by 11. For example: 1364: 1+ 6 = 7 and 7 - 3 - 4 = 0. The number is divisible by 11.If the number is divisible by 3 and 4, it is divisible by 12.There are more divisibility rules that can be used for large numbers.
Can a number be divisible by 6 and 8 without being divisible by 6 times 8 equals 48?
Yes - 24 is divisible by both 6 and 8 - but is NOT divisible by 48
What number is divisible by 2 4 5 6 7 8?
Lots including 840
Is 8 divisible by 1 2 3 4 5 6 7 8 and 9?
Yes, 8 is divisible by any number but, of your list, the only numbers by which 8 is EVENLY divisible are 1, 2, 4, and 8.
Are all even numbers are divisible by 6 and 8?
No, 14 is an even number and is not divisible by 6 or 8.
What is the smallest number that is divisible by 5 6 7 and 8?
840 is the smallest number that is divisible by 5 6 7 and 8.
Is 1728 divisible by 6?
To determine if 1728 is divisible by 6, we need to check if the sum of its digits is divisible by 3 and if it is an even number. The sum of the digits of 1728 is 1+7+2+8=18, which is divisible by 3. Additionally, the last digit of 1728 is 8, which is an even number. Therefore, 1728 is divisible by 6.
What is the smallest number that is divisible by 2 3 4 5 6 7 8 9 and 10?
The smallest number that is divisible by 2 3 4 5 6 7 8 9 and 10 is 2,520.
What four digit number is divisible by 8 but not 2 3 4 5 6 7 or 9?
There is no answer because for a number to be divisible by 8, it would end in an even number and therefore be divisible by 2.
How do you tell if a number is prime or not?
A prime number is one that has only two factors: one and itself.You can tell if a number is prime quickly by using the Laws of Divisibility:Numbers that end in 0, 2, 4, 6, and 8 are divisible by 2.If the sum of a number's digit is divisible by 3, the number itself is divisible by 3.If the last two digits of a number are divisible by 4, the number itself is divisible by 4.If a number ends in 0 or 5, it is divisible by 5.If a number is divisible by both 2 and 3, it is divisible by 6.If you double the last digit and subtract it from the rest of the number and the answer is 0 or divisible by 7, it is divisible by 7. For example, 4364: 4 doubled is 8. 436 - 8 = 424. You still cannot readily tell if the number is divisible by 7, so you can do it again: 4 doubled is 8. 42 - 8 = 34. 34 is not divisible by 7 so 436 is not divisible by 7If the last three digits of a number are divisible by 8, the number itself is divisible by 8.If the sum of the digits of a number is divisible by 9, the number itself is divisible by 9.If a number ends with 0, it is divisible by 10.If you add every other digit and then subtract the rest of the digits and the answer is 0 or is divisible by 11, the number itself is divisible by 11. For example: 1364: 1+ 6 = 7 and 7 - 3 - 4 = 0. The number is divisible by 11.If the number is divisible by 3 and 4, it is divisible by 12.There are more divisibility rules that can be used for large numbers.
What prime number can I divide with 7 and 8?
The only prime number divisible by 7 is 7. There are no prime numbers divisible by 8.
Is 3 divisable of 998876?
No. If the sum of the digits of a number is divisible by 3 then the number will be also. In this case, 9+9+8+8+7+6=47 which is not divisible by 3.
Can a number be divisible by 6 and 8 without being divisible by 6 times 8 equals 48?
Yes - 24 is divisible by both 6 and 8 - but is NOT divisible by 48
What are the rules of the divisibility?
1- Any number is divisible by 1. 2- Any even number is divisible by 2. 3- If its digits add up to a number divisible by 3, the whole number is divisible by 3. 4- If the last two digits are divisible by 4, the whole number is divisible by 4. 5- If it ends in 5 or 0, the whole number is divisible by 5. 6- If it's even and also divisible by 3, the whole number is divisible by 6. 7- There is no rule for 7. 8- If the last three digits are divisible by 8, the whole number is divisible by 8. 9- If its digits add up to a number divisible by 9, the whole number is divisible by 9. 10- If it ends in 0, the whole number is divisible by 10.
What number is divisible by 2 4 5 6 7 8?
Lots including 840
What number is divisible 12 3 4 5 6 7 8 9?
2520
Is 8 divisible by 1 2 3 4 5 6 7 8 and 9?
Yes, 8 is divisible by any number but, of your list, the only numbers by which 8 is EVENLY divisible are 1, 2, 4, and 8.
