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There is a trick to figuring out whether a number is divisible by 7, without having to divide it directly. Unfortunately, the 'shortcut' is almost as hard as simply doing the division in the first place.
But for those who want to know, here's the trick:
- Take the final digit of the number.
- Double it.
- Subtract it from the rest of the digits.
- Repeat until you get a number that is (or isn't) a multiple of 7.
For example, try 98:
- The final digit is 8.
- 8 x 2 = 16.
- 9 (98, without the 8) - 16 = -7.
- -7 is a multiple of 7, so 98 is divisible by 7.
Wiki User
∙ 13y ago
Katya XIE
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How do you know If A number can be divisible by 7?
If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.
What number between 364 and 384 has a multiple of 7 and 3?
378
Which number is a common multiple of 7 and 4?
The smallest number which is a common multiple of both 7 and 4 is 28.
how can the following definition be written correctly as a biconditional statementA multiple of 7 is a number that can be divided by 7 with no remainder.?
A number is a multiple of 7 if and only if it can be divided by 7 with no remainder.
What is the smallest number that is a multiple of both 5 and 7?
The lowest common multiple of 5 and 7 is 35.
What number is relatively prime to 7?
Any number that is not a multiple of 7.Any number that is not a multiple of 7.Any number that is not a multiple of 7.Any number that is not a multiple of 7.
How do you know if a number is divisble by 7?
just see if it is a multiple of 7 or u can divide the digit by 7 to get that answer and if u don't u know that it is not a multiple of 7
How do you know If A number can be divisible by 7?
If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.
How will you know 51272347 can be divided by 7?
7324621
Is the number 258 a multiple of 7?
No, it is not a multiple of 7.
What is this number multiple of 4 an even number a multiple of 7 and not a multiple of 6?
It could be: 4*7 = 28
What is a multiple of 7 that is a prime number?
There is not a multiple of 7 that is prime.
How do you know that 1001 is a multiple of 7?
To calculate whether a number is a multiple of 7, double the last digit and subtract it away from the rest of the number. If this following number divides by 7 without a remainder, then the number is divisible by 7. Continue the process if necessary. In this instance, 100 - (1 x 2) = 98/7 = 14. 1 - (4 x 2) = -7/7 = -1 Therefore, 1001 is a multiple of 7.
What three digit number is a multiple of 7?
105 is a multiple of 7
Is 7 a multiple of 48?
No it is not. To be a multiple of a certain number, the first criterion is that the number must be greater than or equal to the number it is a multiple of. Since 7 is smaller than 48, 7 cannot be a multiple of 48.
What number between 364 and 384 has a multiple of 7 and 3?
378
What number is both a factor and multiple of 7?
The only number that could be both a factor and a multiple is 7 itself.
