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What is the gcf of 45 and 800?

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โˆ™ 2015-11-21 08:27:35

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Greatest common factor of two numbers x and y(x>y) is always less than or equal to y.

So, we will write down only those factors of 800 which are less than or equal to 45.

Factors of 45: 1, 3, 5, 9, 15 and 45.

Factors of 800: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40...

So, Greatest common factor is 5.

Alternate Method:

Method of prime factorization:

45 = 3x3x5

800 = 2x2x2x2x2x5x5

It is clear that 5 is the only number which divides both 45 and 800.

So, gcf of 45 and 800 is 5.

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โˆ™ 2011-04-05 04:27:52
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โˆ™ 2015-11-21 08:27:35

The GCF is 5.

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โˆ™ 2009-12-08 13:19:16

5.

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Q: What is the gcf of 45 and 800?
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