Results of Numerical Puzzles

Futoshiki (easy)    MathemaGrids (medium)    CalcuDoku (slightly harder)

Futoshiki: Place numbers 1–4 in the appropriate blank spaces to satisfy the constraints. Each number should appear once per row and once per column.
MathemaGrids: Place numbers 1–9 in the appropriate blank spaces to satisfy the algebraic constraints.
CalcuDoku: Place numbers 1–4 in the appropriate blank spaces. Each number should appear once per row and once per column. Each cage clue tells you the answer after the cage values have undergone the specified mathematical operation.
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