Mensuration Practice Test 11

Volume of a cube with edge 3 cm = (3)3 = 27 cm3
Volume of a cube with edge (1.5) cm = (1.5)3
= 3.375 cm2
Number of smaller cubes that can be cut
=

27

3.375

= 8 cubes
Surface area of the bigger cube = 6a2 = 54 cm2
Surface area of the smaller cubes = 8 × 6 (1.5)2
= 108 cm2
Percentage increase =

108−54

54

×100 = 100 %