10/39. If you want it lowest terms that's it. If you are subtracting and putting to a fraction it would be 29/39. If you want a percentage I'm gonna settle about 26% without a calculator. You would divide 1/3.9 and multiply by 100. Or 2.9/3.9 times 100 which I settle at 75% without a calculator. In my head I'm getting 25.4.. and 75.6.. then rounding. Anything else you'll have to specify.
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