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If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.

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Divide 7 into it. If the answer has no remainder, the number is divisible by 7.

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Q: How do you determine if a number can be factored by 7?
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Related questions

What is the number 28 factored into prime numbers?

28 = 2 × 2 × 7 = 2² × 7.


A polynomial that can not be factored is called?

If a number cannot be factored it is a prime number.


Is 973 a composite number?

Yes. The number 973 can be factored as 7 x 139. *see related link


What is 6x2-17x plus 7 factored?

6x2-17x+7 = (2x-1)(3x-7) when factored


What is 175 factored into prime number?

As a product of its prime factors: 5*5*7 = 175


How do you write 9x2 plus 2x-7 in factored form?

9x2+2x-7 = (9x-7)(x+1) when factored


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It is 7*7*7.


Can 5x 35 be factored?

If you mean: 5x+35 then when factored it is 5(x+7)


How do you figure out a composite number?

A number can be factored to determine whether it is prime or composite. A prime number has exactly 2 factors, 1 and the number itself. A composite number has more than two factors.


What is number with the prime factorization of 2x3x5x7x11?

You can determine the number you factored by re multiplying all the numbers. 2 • 3 = 6 • 5 = 30 • 7 = 210 • 11 = 2310. So the prime factorization of 2310 is 2 • 3 • 5 • 7 • 11.


What number goes into 208 and 245?

1. 208 can be factored down to 2 x 2 x 2 x 2 x 13. 245 can be factored down to 5 x 7 x 7. Since the two numbers have no common factors, the only number that goes into both is 1.


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It is called a composite number