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To move 4 toothpicks from 4 squares to make 3 squares, you can start by taking one toothpick from each of two squares and using them to create a new square. This will leave you with two squares. Then, take two toothpicks from one of the remaining squares and use them to join the two squares together, forming a larger square. This way, you have successfully moved 4 toothpicks from 4 squares to make 3 squares.
A square has 4 sides therefore 3 squares from 12 toothpicks will simply be three unconnected squares
break the toothpicks and you've doubled your amount of toothpicks
Move 3 lines "from" - do you mean 'remove 3 lines from' - or - move 3 lines to other places? Anyway, this all depends on the layout of the five squares.
Arrange the 9 toothpicks thus: 7 + 3
A sort of triangle of squares. Lay out 3 squares side by side using 10 matches. Take the middle match from the bottom row and use it and the other two to make a square based on the middle match of the top row.