110. 1X1 Square : Add 16 creating 5 equal Squares

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Add 16 matchsticks creating 5 squares equal in size

(If you do some maths beforehand you can actually figure out ho to place them.)

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Forming 5 squares with 20 sticks (16 + 4) means 4 sticks are used per square. (20 / 5 = 4) Therefore, no two squares are adjacent using a common stick to form a side. Understanding this makes the puzzle easy.

There are also other solutions.

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