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If a number is divisible by six, then it must also be divisible by both two and three. To check it then, you simply apply both rules for each of those:
Is it an even number?
Is the sum of it's digits divisible by three?
If both answers are yes, then the number is divisible by six.
To find out if a number is divisible by seven take it's last digit, double it, and subtract it from the remaining digits. If the result is divisible by seven, then the original number is as well.
For example is three 343 divisible by 7? Let's find out:
3 * 2 = 6, and 34 - 6 = 28. Is 28 divisible by seven? Yes, but if you're not sure, you can repeat the process. 8 * 2 = 16, 2 - 16 = -14. 14 is of course divisible by 7.
If the last three digits of a number are divisible by 8, then the entire number is. For example, I know that 10923485710234985723908471859256 is divisible by eight, because I know that the last three digits, 256, form a number that's divisible by eight. Not sure about those last three digits? Simply divide them by two, three times in a row. If the result is a whole number, then it's divisible by eight. 256 / 2 = 128, 128 / 2 = 64, 64 / 2 = 32, so 256 is divisible by eight, and therefore 10923485710234985723908471859256 is also.
If the sum of the digits is divisible by 9, then the number itself is. For example, is 8936523 divisible by 9? Well, 8 + 9 + 3 + 6 + 5 + 2 + 3 = 36. Is 36 divisible by 9? 3 + 6 = 9. 9 is obviously divisible by 9, so yes, 8936523 is also.
If the last digit is a zero, then the number is divisible by 10. For example, 12340 is divisible by ten, but 12345 is not.
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What are the divisibility rules of 42?
It is divisible by any of its factors which are: 1, 2, 3, 6, 7, 14, 21 and 42
What are the divisibility rules for 1 through 50?
Do the division, if there is no remainder, it is divisible. Seriously, many of the "divisibility rules" that have been discovered become more complicated than doing the actual division. For practical purposes, just learn the divisibility rules for a few simple cases (divisibility rules by 2, 4, 8, 5, 10, 3, 9, 7, 11, and 13), and for all other cases, just do the division.
What is the divisibility rule for 21?
For any practical purpose, it is easier to simply divide, instead of looking for fancy divisibility rules. However, you can apply the divisibility rules for 3 and for 7. This works because (a) their product is 21, and (b) these numbers are relatively prime.
What is 3 over 10 divided by 7 over 6?
(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35
What are the divisibility rules for 23?
Take the last digit and add 7 times to the rest of the number. Ex: 5888 588+ (7x8)=644, 644/23= 28
Write about a reallied situation that can be solved using divisibility rules solve it?
3+7=10
What are the divisibility rules of 42?
It is divisible by any of its factors which are: 1, 2, 3, 6, 7, 14, 21 and 42
What are the divisibility rules for 1 through 50?
Do the division, if there is no remainder, it is divisible. Seriously, many of the "divisibility rules" that have been discovered become more complicated than doing the actual division. For practical purposes, just learn the divisibility rules for a few simple cases (divisibility rules by 2, 4, 8, 5, 10, 3, 9, 7, 11, and 13), and for all other cases, just do the division.
What is the greatest common factor of 91 and 49 using the divisibility rules?
It is: 7
What is the divisibility rule for 21?
For any practical purpose, it is easier to simply divide, instead of looking for fancy divisibility rules. However, you can apply the divisibility rules for 3 and for 7. This works because (a) their product is 21, and (b) these numbers are relatively prime.
What is the divisibility rules of 7?
If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.
How can you tell if 53 is a prime number?
The square root of 53 is between 7 and 8. If 53 was composite, half of its factors would be less than its square root. By the rules of divisibility, we know that 53 is not divisible, by 2, 3, 4, 5, 6 or 7. It has to be prime.
What are the divisibility rules for 23?
Take the last digit and add 7 times to the rest of the number. Ex: 5888 588+ (7x8)=644, 644/23= 28
How can you check to be sure that you have found all the factors of 100?
You know that the square root of 100 is 10, so half the remaining factors will be greater than 10, half lesser. By the rules of divisibility, you know that 100 is not divisible by 3, 6, 7, 8 or 9. That leaves 1, 2, 4 and 5. Divide them into 100. 1, 2, 4, 5, 10, 20, 25, 50, 100
What is 3 over 10 divided by 7 over 6?
(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35(3/10) / (7/6) = (3/10) *(6/7) = 18/70 = 9/35
What is the divisibility for the number 7?
7 is only divisible by 1 and itself.
What is the pattern for 85491761032?
spell out the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 in English then alphabetize them.
