Easy mathz f.2 plz help,quick plz

a)Round off the following number to the nearest Hundredth & Tenth & Integer.
1) 2.4364
2) 8.3745
3) 18.6781
b)Round off the following number to 1sig.fig & 2sig.fig &3sg.fg.
1) 0.001048
2) 23.85
3) 760346
c)Express 1745340mm to the nearest
1)cm
2)m
3)km