Please answer this question ..

Dear student,
S.I. unit of volume =cubic meter (m³)
Hence, two smaller unit of volume are
1. cubic centimetre (symbol cm³)
2. cubic decimetre (symbol 1 dm³). 
Now,
$cubic centimetre= 1 cm\times 1 cm\times 1cm=0.01m\times 0.01m\times 0.01m ={10}^{-6 }{m}^3$
​​​​​​and
$cubic decimetre=1 dm\times 1dm\times 1 dm= 0.1 m\times 0.1m\times 0.1m ={10}^{-3} m^3$

Regards,