What is 0.105as a fraction in simplest form

21/200

Explanation:  

In order to simplify a fraction there must be:

a number that will divide evenly into both the numerator and denominator so it can be reduced. No such number exists for 21 and 200.

or

the numerator must be greater than the denominator, (an improper fraction), so it can be converted to a mixed number. 21 is not greater than 200.

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21/200

Explanation:

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.