diff --git a/src/wren_core.c b/src/wren_core.c
index d84abad9..c4f4ea90 100644
--- a/src/wren_core.c
+++ b/src/wren_core.c
@@ -878,6 +878,11 @@ DEF_PRIMITIVE(num_cos)
   RETURN_NUM(cos(AS_NUM(args[0])));
 }
 
+DEF_PRIMITIVE(num_deg)
+{
+  RETURN_NUM(floor(AS_NUM(args[0]) * 57.2957795130823208768));
+}
+
 DEF_PRIMITIVE(num_floor)
 {
   RETURN_NUM(floor(AS_NUM(args[0])));
@@ -888,6 +893,11 @@ DEF_PRIMITIVE(num_isNan)
   RETURN_BOOL(isnan(AS_NUM(args[0])));
 }
 
+DEF_PRIMITIVE(num_rad)
+{
+  RETURN_NUM(floor(AS_NUM(args[0]) / 57.2957795130823208768));
+}
+
 DEF_PRIMITIVE(num_sin)
 {
   RETURN_NUM(sin(AS_NUM(args[0])));
@@ -1514,8 +1524,10 @@ void wrenInitializeCore(WrenVM* vm)
   PRIMITIVE(vm->numClass, "abs", num_abs);
   PRIMITIVE(vm->numClass, "ceil", num_ceil);
   PRIMITIVE(vm->numClass, "cos", num_cos);
+  PRIMITIVE(vm->numClass, "deg", num_deg);
   PRIMITIVE(vm->numClass, "floor", num_floor);
   PRIMITIVE(vm->numClass, "isNan", num_isNan);
+  PRIMITIVE(vm->numClass, "rad", num_rad);
   PRIMITIVE(vm->numClass, "sin", num_sin);
   PRIMITIVE(vm->numClass, "sqrt", num_sqrt);
   PRIMITIVE(vm->numClass, "toString", num_toString);