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diff --git a/16/x/modex/MATH.INC b/16/x/modex/MATH.INC
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+;
+; MATH.INC - Include file for THREED.ASM
+;
+
+; 3-dimensional point, coordinates in fixed format (16:16)
+;
+TPOINT  STRUC
+        X       DD      ?
+        Y       DD      ?
+        Z       DD      ?
+TPOINT  ENDS
+
+; 2-dimensional point, coordinates in integer format
+;
+TIMAGEPOINT     STRUC
+        IX      DW      ?
+        IY      DW      ?
+TIMAGEPOINT     ENDS
+
+; Fixed-point divide: EAX = EAX / arg
+;
+.xdiv   MACRO   arg
+        xor     edx, edx
+        shld    edx, eax, 16
+        shl     eax, 16
+        idiv    arg
+ENDM
+
+; Fixed-point multiply: EAX = EAX * arg
+;
+.xmul   MACRO   arg
+        imul    arg
+        shrd    eax, edx, 16
+ENDM