7/9 is equal to 0.77777 (repeating over and over again) This fraction cannot be simplified any lower than what it is. But yes, the decimal number of this is 0.77778 (rounded off this answer would be 0.7778.)
In 15476, 5 is the place value of thousand. For rounding it to nearest 1000, check the next digit to 5. It is 4, which is less than 5. So, 15476 rounded to 1000 is 15000
