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I'm guessing you mean HCF. You need to find the different factors of each number and then find the biggest one that is common in all 3:126= 1 & 126, 196=1 & 196, 378=1 & 378,

2 & 63, 2 & 98, 2 & 189,

3 & 42, 4 & 49, 3 &126,

6 & 21, 7 & 28, 6 & 63,

7 & 18, 14 &14 7 & 54,

9 & 14 9 & 42,

14 & 27,

18 & 21

I believe that the highest common factor would be 14

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Wiki User

8y ago

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More answers

It is: 14

126 = 14 x 9

196 = 14 x 14

378 = 14 x 27

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Wiki User

9y ago
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Anonymous

4y ago
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ans:14

and u call that

wiki

a smartass

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Anonymous

4y ago
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Q: What is the highest common factor of 126 and 196 and 378?
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