To start all over!
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means you go down on me and I owe you one.
There are a number of possible configurations for the drawing and the question does not make clear which is intended. One possibility is that of a large square which contains a medium sized square whose vertices are at the midpoints of the sides of the larger square and which, in turn, contains a smaller square defined in the same way. One way to draw this figure would be to start at the midpoint of a side of the largest square and go all the way round it. Then move on to the middle square and draw only half of one side. Move to the smallest square and go all round it. Then continue and complete the middle square.
There are 100 square decimeters in one square meter. This is because a square meter is a unit of area equal to a square with sides measuring one meter each, and a square decimeter is a unit of area equal to a square with sides measuring one decimeter (0.1 meters) each. Therefore, to convert from square meters to square decimeters, you multiply by 100.
Square root. Except that it is not quite as simple as that. If you start with a negative number, say -3. Square it to get 9. Then find the square root: should you go for -3 or +3 as the square root? Unless you knew what the original number was, the "inverse" may not take you back to the starting point!
he can move only one square per turn, but he can go backward