The decimal for this fraction is 5.5
A)
Accurate = close to the 'true' value, and 9.998 is close to 10. Imagine a scale that has the zero point wrong as says 8.998, it would not be accurate, but still precise (several digits known)
Precise = several digits known. I would say to know it until grams is quite a good precision (the 9.998 has 4 digits)
The 6th grade one is b and the teacher one is A