Fix issue #58

src/Decimal.php

@@ -146,6 +146,9 @@ public static function fromString(string $strValue, int $scale = null): Decimal
         $scale = $scale ?? $min_scale;
         if ($scale < $min_scale) {
             $value = self::innerRound($value, $scale);
+        } elseif ($min_scale < $scale) {
+            $hasPoint = (false !== \strpos($value, '.'));
+            $value .= ($hasPoint ? '' : '.') . \str_pad('', $scale - $min_scale, '0');
         }
 
         return new static($value, $scale);

tests/regression/issue58Test.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+use Litipk\BigNumbers\Decimal;
+use PHPUnit\Framework\TestCase;
+
+class issue58Test extends TestCase
+{
+    public function test_that_fromString_preserves_the_correct_inner_scale_to_avoid_divisions_by_zero()
+    {
+        $value = Decimal::create('12.99', 4);
+        $divisor = Decimal::create(2, 4);
+
+        $this->assertEquals(6.495, $value->div($divisor)->asFloat());
+    }
+}