23.***** Leena cut small cubes of 10 cubic cms each, which she joined to form a cube with 10 cm length, 5 cm in depth and 5 cm wide. How many more small cubes does she require to form a perfect cube?

• volume of small cube = 10 cubic cm
  volume of the cuboid made = 10*5*5 = 250 cubic cm
  no. of cubes already cut = 25
  to make it a perfect cube we need side of the cube to be 10 cm as the longest side of the cuboid is 10 cm
  volume of the required cube = 10*10*10 = 1000 cubic cm
  no. of smaller cubes to make a perfect cube = 100
  required no. of cubes that needed to be cut = 100-25
  75
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