Well.. am struggling on my maths homework... could anyone help me?

The question is:
Write to 1 decimal place...
a) 4.64
b) 3.99
c) 4.78
d) 5.65
e) 4.719

Help anyone? xx

4.64 would be rounded to just 4.6. However, if it were 4.65 your round up to 4.7