First we have to multiply the numerator and the denominator by 10. So 0.3 / 0.4 = 3 / 4. Then we can divide 3 by 4. 3 : 4 = 0.75. Another way is to multiply again the numerator and the denominator by 25. 3 / 4 * 25 / 25 = 75 / 100: And finally: 75 / 100 = 0.75. Answer: A fraction 0.3/0.7 as a decimal is 0.75. Hope this helps. Let me know if you need additional help!