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Because it can be expressed as a ratio of integers. 105/10
10.5 is, itself, a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 105/10. You can simplify that if you so wish.
10.5
10.5
divide 105 by 10 = 10.5