Why not tryng to do some mental calculation for change. This could be done with the puzzle the Balance , the rule is simple put the signe + or - in each box in such a way that at the end the two sides of the scales are equal. The result could be less than zero.
1)
The printable puzzles PDF.
Puzzle : bal_4X15_0071.pdf
Solution : bal_4X15_0071_sol.pdf
2)
The printable puzzles PDF.
Puzzle : bal_4X15_0072.pdf
Solution : bal_4X15_0072_sol.pdf
3)
The printable puzzles PDF.
Puzzle : bal_4X15_0073.pdf
Solution : bal_4X15_0073_sol.pdf
4)
The printable puzzles PDF.
Puzzle : bal_4X15_0074.pdf
Solution : bal_4X15_0074_sol.pdf
Have a good day !
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