6.9*10^7 is in standard form.
In expanded form, it is 69,000,000
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69 is an integer and not a fraction. One possible equivalent form is 690/10.
69/28
69 is an integer and can be expressed in rational form as 69/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
0.69 is 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. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is 69/100 which cannot be simplified further.
2.76 in improper fraction form = 276/100 = 69/25 or 219/25 as a mixed number.