For example, one article have 100 words, so how many key words should have?

Why are people still asking about keyword density? Just write copy your readers will enjoy or find informative--preferably both.

Red This.

3 to 5 per page.

I agree with Mime, just write what u can make reader enjoy it. Better put 2,3 keywords in your article.

For 100words, 2 words would be enough.

What I do is include the keyword in the <title> , <h1> , <h2> and 2 or 3 times in <p>, also variations of the word could count as valid.

I am writing my keyword in the first paragraph and in any paragraph where i see it fit to. 2 to 3 occurrence of the keyword in an article will do. Further, i am putting emphasis on the keywords through Bold or Italics.

i think this is not fixed , you can have more keywords , but only 2-3 anchor texts in this article . and of course this is not to say more keyword more better .

I prepare having 3 keyword in an article.

it Depends on in which website u r submitting your article because Ezine take KD less than 2 % it means use only 2 keywords and all other article sites u can use more than 2 keyword for article base and article dash board ...........

2 -3 keywords are enough in 100 word article.

I use 2-5 keywords. Better make it natural for reading.

I will suggest you put 2 to 3 in 100 words article.

Originally Posted by charlestaylor98

For example, one article have 100 words, so how many key words should have?

we need about 3-4 % of total word your article.

Originally Posted by chrishirst

3 to 5 per page.

Originally Posted by eimroda

I am writing my keyword in the first paragraph and in any nitromes paragraph where i see it fit to. 2 to 3 occurrence of the keyword in an article will do. Further, i am putting agames emphasis on the keywords through Bold or Italics.

yap you right

Originally Posted by thesslstore1

There are 2 or 3 at most link you may add because some nitrome submition site not allow 1, 2, 3
you use you keyword but not at a agame back link.

you have 100 word than 5 or 10 word of keyword is best

i agree . the important is dont spam your article with publish a lot of Keyword. make good article

we need about 3-4 % of total word your article.