Find the amount of the solution in Moles

Find the amount, in moles, of solute dissolved in the following solution:
1)4dm^3 of a 2 mol dm^-3 solution.
2)25.0cm^3 of a 0.150 mol dm^-3 solution.
3)24.35 cm^3 of a 0.125 mol dm^-3 solution.

Thank You :)

1) Must be 4*2 = 8 mol
2) 25/1000*0.150 = 0.00375 mol
3) 24.35/1000*0.125 = 0.00304