diff --git a/100_core/src/gplx/Decimal_adp.java b/100_core/src/gplx/Decimal_adp.java
index 673356c3f..14b1499a7 100644
--- a/100_core/src/gplx/Decimal_adp.java
+++ b/100_core/src/gplx/Decimal_adp.java
@@ -80,6 +80,9 @@ public class Decimal_adp implements CompareAble {
 		} 
 		return new Decimal_adp(new_val);
 	}
+	public Decimal_adp Round_to_default_precision() {
+		return new Decimal_adp(under.round(Decimal_adp_.Gplx_rounding_context));
+	}
 	public boolean Comp_gte(Decimal_adp v) 				{return under.doubleValue() >= v.under.doubleValue();}
 	public boolean Comp_gte(int v) 						{return under.doubleValue() >= v;}
 	public boolean Comp_lte(Decimal_adp v) 				{return under.doubleValue() <= v.under.doubleValue();}
diff --git a/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Func_tkn_ln.java b/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Func_tkn_ln.java
index 6c56539e7..bd0e7b1ec 100644
--- a/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Func_tkn_ln.java
+++ b/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Func_tkn_ln.java
@@ -23,7 +23,9 @@ class Func_tkn_ln extends Func_tkn_base {
 	@Override public boolean Calc_hook(Xop_ctx ctx, Pfunc_expr_shunter shunter, Val_stack val_stack) {
 		Decimal_adp val = val_stack.Pop();
 		if (val.Comp_lte(0)) {shunter.Err_set(ctx, Xol_msg_itm_.Id_pfunc_expr_invalid_argument_ln); return false;}		
-		val_stack.Push(Decimal_adp_.double_(Math_.Log(val.To_double())));
+		val = Decimal_adp_.double_(Math_.Log(val.To_double()));
+		val = val.Round_to_default_precision();// NOTE: needed for test; may need to apply to other ops; DATE:2020-03-24
+		val_stack.Push(val);
 		return true;
 	}
 }
diff --git a/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_shunter.java b/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_shunter.java
index 8de6c9a19..307a5543e 100644
--- a/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_shunter.java
+++ b/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_shunter.java
@@ -95,6 +95,7 @@ public class Pfunc_expr_shunter {
 							}
 							if (num == null) return Null_rslt;
 						}
+						num = num.Round_to_default_precision(); // PURPOSE: number should be set to precision of 14; PAGE:de.wikipedia.org/wiki/Nationalpark_Mu_Ko_Ang_Thong ISSUE#:683 DATE:2020-03-24
 						val_stack.Push(num);
 						mode_expr = false;
 						break;
diff --git a/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_tst.java b/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_tst.java
index 6a021986f..1a0e78a54 100644
--- a/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_tst.java
+++ b/400_xowa/src/gplx/xowa/xtns/pfuncs/exprs/Pfunc_expr_tst.java
@@ -112,4 +112,7 @@ public class Pfunc_expr_tst {
 	@Test  public void Exc_unrecognized_word_ornot()			{fxt.Test_parse_tmpl_str_test("{{#expr:0ornot0}}"			, "{{test}}"	, "<strong class=\"error\">Expression error: Unrecognised word \"ornot\"</strong>");}	// PURPOSE: handle nan; EX: w:Help:Calculation
 	@Test  public void Exc_unrecognized_word_notnot()			{fxt.Test_parse_tmpl_str_test("{{#expr:notnot0}}"			, "{{test}}"	, "<strong class=\"error\">Expression error: Unrecognised word \"notnot\"</strong>");}	// PURPOSE: handle nan; EX: w:Help:Calculation
 	@Test  public void Exc_unrecognized_word_sinln()			{fxt.Test_parse_tmpl_str_test("{{#expr:sinln1.1}}"			, "{{test}}"	, "<strong class=\"error\">Expression error: Unrecognised word \"sinln\"</strong>");}	// PURPOSE: handle nan; EX: w:Help:Calculation
+	@Test  public void Num_precision() {// PURPOSE: number should be set to precision of 14; PAGE:de.wikipedia.org/wiki/Nationalpark_Mu_Ko_Ang_Thong ISSUE#:683 DATE:2020-03-24
+		fxt.Test__parse__tmpl_to_html("{{#expr:15.064329981401556}}", "15.064329981402"); // fails if 15.06432998140155
+	}
 }