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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?
1728 is divisible by 6. 1728/6=298A number is divisible by 6 if:The number is evenThe sum of the digits is divisible by three1728 is an even number.1+7+2+8=1818 is divisible by three.Therefore 1728 is divisible by 6.Note: You can also add 1+8=9 to make it simpler to check if it is divisible by 3.
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 12 3 4 5 6 7 8 9?
2520
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.
