Best Answer

Use some rules, then just guess.

All even numbers have 2 as a factor.

All numbers ending in 0 or 5 have 5 as a factor.

Add all the digits, if that is divisible by 3 or 9 then the original number will also have 3 or 9 as a factor.

If you know a list of squares, then (in your head) compare to the number you have.

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Q: How to factor large numbers?

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A factor that is the same for two or more numbers is known as a "common factor" for those numbers.

All even numbers have 2 as a factor.

Yes, the greatest common factor of a pair of numbers can equal one of the numbers if one of the numbers is a factor of the other.

1 is the factor that is common to all numbers.

1 is a factor of all positive numbers.

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The factor numbers are 3 and -17.

A factor that is the same for two or more numbers is known as a "common factor" for those numbers.

All even numbers have 2 as a factor.

One of the numbers is a factor of the other.

Yes, the greatest common factor of a pair of numbers can equal one of the numbers if one of the numbers is a factor of the other.

The HCF is always a factor of the LCM of two numbers. The HCF is a factor of both the numbers which are factors of their LCM. Thus the HCF is also a factor of the LCM of the two numbers.

Yes. Factors are just numbers. All numbers have factors.

1 is the factor that is common to all numbers.

One is a factor of all nonzero numbers.

The largest common factor of two or more numbers is the factor that goes into both numbers. Such as: the largest common factor of 2 and 4 is 2 The largest common factor of two or more numbers is the factor that goes into both numbers. Such as: the largest common factor of 2 and 4 is 2 That's the greatest common factor, or GCF.

A number that is a factor of two or more numbers is simply a common factor

All numbers with 12 as a factor have 2 as a factor, but not all have 10 as a factor.

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