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diff --git a/src/BasicCalculator/Add.php b/src/BasicCalculator/Add.php
index 09fc3fd..bded2fc 100644
--- a/src/BasicCalculator/Add.php
+++ b/src/BasicCalculator/Add.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kobens\Math\BasicCalculator;
 
 /**
diff --git a/src/BasicCalculator/Compare.php b/src/BasicCalculator/Compare.php
index c6f765b..b3b9212 100644
--- a/src/BasicCalculator/Compare.php
+++ b/src/BasicCalculator/Compare.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kobens\Math\BasicCalculator;
 
 /**
diff --git a/src/BasicCalculator/Divide.php b/src/BasicCalculator/Divide.php
index 05abbb8..bd12c15 100644
--- a/src/BasicCalculator/Divide.php
+++ b/src/BasicCalculator/Divide.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kobens\Math\BasicCalculator;
 
 /**
@@ -7,7 +9,6 @@
  * is no automatic precision (scale) detection for Divide.
  *
  * TODO: Verify strings
- * TODO: Verify divisor is not zero
  */
 final class Divide
 {
@@ -15,11 +16,13 @@ private function __construct() { }
 
     public static function getResult(string $dividend, string $divisor, int $scale): string
     {
+        if (Compare::getResult($divisor, '0') === Compare::EQUAL) {
+            throw new \InvalidArgumentException('Cannot divide by zero.');
+        }
         $result = \bcdiv($dividend, $divisor, $scale);
         if (\strpos($result, '.') !== false) {
             $result = \rtrim(\rtrim($result, '0'), '.');
         }
         return $result;
     }
-
 }
diff --git a/src/BasicCalculator/Multiply.php b/src/BasicCalculator/Multiply.php
index ef7fabe..cc30e20 100644
--- a/src/BasicCalculator/Multiply.php
+++ b/src/BasicCalculator/Multiply.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kobens\Math\BasicCalculator;
 
 final class Multiply
diff --git a/src/BasicCalculator/Subtract.php b/src/BasicCalculator/Subtract.php
index f714a0e..bb68409 100644
--- a/src/BasicCalculator/Subtract.php
+++ b/src/BasicCalculator/Subtract.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kobens\Math\BasicCalculator;
 
 /**
diff --git a/src/PercentDifference.php b/src/PercentDifference.php
index 7e620c1..f83583f 100644
--- a/src/PercentDifference.php
+++ b/src/PercentDifference.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Kobens\Math;
 
 use Kobens\Math\BasicCalculator\Compare;
diff --git a/test/Unit/BasicCalculator/AddTest.php b/test/Unit/BasicCalculator/AddTest.php
index cb4d89b..463cb0e 100644
--- a/test/Unit/BasicCalculator/AddTest.php
+++ b/test/Unit/BasicCalculator/AddTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace KobensTest\Math\Unit\BasicCalculator;
 
 use Kobens\Math\BasicCalculator\Add;
diff --git a/test/Unit/BasicCalculator/CompareTest.php b/test/Unit/BasicCalculator/CompareTest.php
index 07d6912..af9c744 100644
--- a/test/Unit/BasicCalculator/CompareTest.php
+++ b/test/Unit/BasicCalculator/CompareTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace KobensTest\Math\Unit\BasicCalculator;
 
 use Kobens\Math\BasicCalculator\Compare;
diff --git a/test/Unit/BasicCalculator/DivideTest.php b/test/Unit/BasicCalculator/DivideTest.php
index 29211d6..e810b75 100644
--- a/test/Unit/BasicCalculator/DivideTest.php
+++ b/test/Unit/BasicCalculator/DivideTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace KobensTest\Math\Unit\BasicCalculator;
 
 use Kobens\Math\BasicCalculator\Divide;
@@ -28,4 +30,10 @@ public function testGetResult(): void
         $this->assertEquals('33.3',  Divide::getResult('100', '3', 1));
         $this->assertEquals('33.33', Divide::getResult('100', '3', 2));
     }
+
+    public function testDividingByZeroThrowsException(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        Divide::getResult('1', '0', 1);
+    }
 }
diff --git a/test/Unit/BasicCalculator/MultiplyTest.php b/test/Unit/BasicCalculator/MultiplyTest.php
index 2764199..cb3a47a 100644
--- a/test/Unit/BasicCalculator/MultiplyTest.php
+++ b/test/Unit/BasicCalculator/MultiplyTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace KobensTest\Math\Unit\BasicCalculator;
 
 use Kobens\Math\BasicCalculator\Multiply;
diff --git a/test/Unit/BasicCalculator/SubtractTest.php b/test/Unit/BasicCalculator/SubtractTest.php
index 8e2b28f..22654c2 100644
--- a/test/Unit/BasicCalculator/SubtractTest.php
+++ b/test/Unit/BasicCalculator/SubtractTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace KobensTest\Math\Unit\BasicCalculator;
 
 use Kobens\Math\BasicCalculator\Subtract;
diff --git a/test/Unit/PercentDifferenceTest.php b/test/Unit/PercentDifferenceTest.php
index 5efdb16..03bdad2 100644
--- a/test/Unit/PercentDifferenceTest.php
+++ b/test/Unit/PercentDifferenceTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace KobensTest\Math;
 
 use Kobens\Math\PercentDifference;