You prepare a knife and a potato first, then hold the handle with both hands, chop at the potato, chop again, chop again, chop again, chop again, chop again, chop again, chop OK 6 to make a small square. Continue in the same way. If you want 1cm3 (cubic centimeter), you can measure the length of each side with a ruler and draw a line with a stroke.

Be careful to ask your mother to accompany you. Watch your hands.