diff --git a/src/Utils/Decimal.php b/src/Utils/Decimal.php
index 7ec003c..02978de 100644
--- a/src/Utils/Decimal.php
+++ b/src/Utils/Decimal.php
@@ -16,7 +16,10 @@ class Decimal
 {
     protected $source;
     protected $dp;
+
+    // Rounds away from zero.
     const ROUND_UP = 0;
+    // Rounds towards zero.
     const ROUND_DOWN = 1;
 
     function __construct($v, int $dp = 8)
@@ -44,7 +47,7 @@ class Decimal
     function __call($name, $arguments)
     {
         $methods = ['add', 'sub', 'mul', 'div'];
-        if (Arr::has($methods, $name)) {
+        if (in_array($name, $methods)) {
             $method = "bc$name";
             $v = new Decimal($arguments[0]);
             return new Decimal($method($this->source, $v->getSource()));
@@ -63,9 +66,9 @@ class Decimal
         return (new Decimal($v))->getSource() == new Decimal($this->source);
     }
 
-    function toDecimalPlaces(int $dp)
+    function toDecimalPlaces(int $dp, int $rm = self::ROUND_UP): Decimal
     {
-        return new Decimal($this->source, $dp);
+        return new Decimal($this->toFixed($dp, $rm), $dp);
     }
 
     function toFixed(int $dp, int $rm = self::ROUND_UP): string