diff --git a/core/includes/common.inc b/core/includes/common.inc
index a4805c0..930f7b0 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -2,6 +2,7 @@
 
 use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\Json;
+use Drupal\Component\Utility\Number;
 use Drupal\Component\Utility\String;
 use Drupal\Component\Utility\Tags;
 use Drupal\Component\Utility\Url;
@@ -628,47 +629,24 @@ function valid_url($url, $absolute = FALSE) {
 /**
  * Verifies that a number is a multiple of a given step.
  *
- * The implementation assumes it is dealing with IEEE 754 double precision
- * floating point numbers that are used by PHP on most systems.
+ * @see \Drupal\Component\Utility\Number::validStep()
  *
- * This is based on the number/range verification methods of webkit.
- *
- * @param $value
+ * @param numeric $value
  *   The value that needs to be checked.
- * @param $step
+ * @param numeric $step
  *   The step scale factor. Must be positive.
- * @param $offset
+ * @param numeric $offset
  *   (optional) An offset, to which the difference must be a multiple of the
  *   given step.
  *
  * @return bool
  *   TRUE if no step mismatch has occured, or FALSE otherwise.
  *
- * @see http://opensource.apple.com/source/WebCore/WebCore-1298/html/NumberInputType.cpp
+ * @deprecated as of Drupal 8.0. Use
+ *   \Drupal\Component\Utility\Number::validStep() directly instead
  */
 function valid_number_step($value, $step, $offset = 0.0) {
-  $double_value = (double) abs($value - $offset);
-
-  // The fractional part of a double has 53 bits. The greatest number that could
-  // be represented with that is 2^53. If the given value is even bigger than
-  // $step * 2^53, then dividing by $step will result in a very small remainder.
-  // Since that remainder can't even be represented with a single precision
-  // float the following computation of the remainder makes no sense and we can
-  // safely ignore it instead.
-  if ($double_value / pow(2.0, 53) > $step) {
-    return TRUE;
-  }
-
-  // Now compute that remainder of a division by $step.
-  $remainder = (double) abs($double_value - $step * round($double_value / $step));
-
-  // $remainder is a double precision floating point number. Remainders that
-  // can't be represented with single precision floats are acceptable. The
-  // fractional part of a float has 24 bits. That means remainders smaller than
-  // $step * 2^-24 are acceptable.
-  $computed_acceptable_error = (double)($step / pow(2.0, 24));
-
-  return $computed_acceptable_error >= $remainder || $remainder >= ($step - $computed_acceptable_error);
+  return Number::validStep($value, $step, $offset);
 }
 
 /**
diff --git a/core/includes/form.inc b/core/includes/form.inc
index 5abf669..c7aff5b 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -7,6 +7,7 @@
 
 use Drupal\Component\Utility\Crypt;
 use Drupal\Component\Utility\NestedArray;
+use Drupal\Component\Utility\Number;
 use Drupal\Core\Form\FormInterface;
 use Drupal\Core\Form\BaseFormIdInterface;
 use Drupal\Core\Database\Database;
@@ -4364,7 +4365,7 @@ function form_validate_number(&$element, &$form_state) {
     // #min is set).
     $offset = isset($element['#min']) ? $element['#min'] : 0.0;
 
-    if (!valid_number_step($value, $element['#step'], $offset)) {
+    if (!Number::validStep($value, $element['#step'], $offset)) {
       form_error($element, t('%name is not a valid number.', array('%name' => $name)));
     }
   }
diff --git a/core/lib/Drupal/Component/Utility/Number.php b/core/lib/Drupal/Component/Utility/Number.php
new file mode 100644
index 0000000..5df6cf4
--- /dev/null
+++ b/core/lib/Drupal/Component/Utility/Number.php
@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Utility\Number.
+ */
+namespace Drupal\Component\Utility;
+
+/**
+ * Provides helper methods for manipulating numbers.
+ */
+class Number {
+
+  /**
+   * Verifies that a number is a multiple of a given step.
+   *
+   * The implementation assumes it is dealing with IEEE 754 double precision
+   * floating point numbers that are used by PHP on most systems.
+   *
+   * This is based on the number/range verification methods of webkit.
+   *
+   * @param numeric $value
+   *   The value that needs to be checked.
+   * @param numeric $step
+   *   The step scale factor. Must be positive.
+   * @param numeric $offset
+   *   (optional) An offset, to which the difference must be a multiple of the
+   *   given step.
+   *
+   * @return bool
+   *   TRUE if no step mismatch has occured, or FALSE otherwise.
+   *
+   * @see http://opensource.apple.com/source/WebCore/WebCore-1298/html/NumberInputType.cpp
+   */
+  public static function validStep($value, $step, $offset = 0.0) {
+    $double_value = (double) abs($value - $offset);
+
+    // The fractional part of a double has 53 bits. The greatest number that
+    // could be represented with that is 2^53. If the given value is even bigger
+    // than $step * 2^53, then dividing by $step will result in a very small
+    // remainder. Since that remainder can't even be represented with a single
+    // precision float the following computation of the remainder makes no sense
+    // and we can safely ignore it instead.
+    if ($double_value / pow(2.0, 53) > $step) {
+      return TRUE;
+    }
+
+    // Now compute that remainder of a division by $step.
+    $remainder = (double) abs($double_value - $step * round($double_value / $step));
+
+    // $remainder is a double precision floating point number. Remainders that
+    // can't be represented with single precision floats are acceptable. The
+    // fractional part of a float has 24 bits. That means remainders smaller than
+    // $step * 2^-24 are acceptable.
+    $computed_acceptable_error = (double)($step / pow(2.0, 24));
+
+    return $computed_acceptable_error >= $remainder || $remainder >= ($step - $computed_acceptable_error);
+  }
+
+}
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/ValidNumberStepUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/ValidNumberStepUnitTest.php
deleted file mode 100644
index 2d5d314..0000000
--- a/core/modules/system/lib/Drupal/system/Tests/Common/ValidNumberStepUnitTest.php
+++ /dev/null
@@ -1,77 +0,0 @@
-<?php
-
-/**
- * @file
- * Definition of Drupal\system\Tests\Common\ValidNumberStepUnitTest.
- */
-
-namespace Drupal\system\Tests\Common;
-
-use Drupal\simpletest\UnitTestBase;
-
-/**
- * Tests number step validation by valid_number_step().
- */
-class ValidNumberStepUnitTest extends UnitTestBase {
-  public static function getInfo() {
-    return array(
-      'name' => 'Number step validation',
-      'description' => 'Tests number step validation by valid_number_step()',
-      'group' => 'Common',
-    );
-  }
-
-  /**
-   * Tests valid_number_step() without offset.
-   */
-  function testNumberStep() {
-    // Value and step equal.
-    $this->assertTrue(valid_number_step(10.3, 10.3));
-
-    // Valid integer steps.
-    $this->assertTrue(valid_number_step(42, 21));
-    $this->assertTrue(valid_number_step(42, 3));
-
-    // Valid float steps.
-    $this->assertTrue(valid_number_step(42, 10.5));
-    $this->assertTrue(valid_number_step(1, 1/3));
-    $this->assertTrue(valid_number_step(-100, 100/7));
-    $this->assertTrue(valid_number_step(1000, -10));
-
-    // Valid and very small float steps.
-    $this->assertTrue(valid_number_step(1000.12345, 1e-10));
-    $this->assertTrue(valid_number_step(3.9999999999999, 1e-13));
-
-    // Invalid integer steps.
-    $this->assertFalse(valid_number_step(100, 30));
-    $this->assertFalse(valid_number_step(-10, 4));
-
-    // Invalid float steps.
-    $this->assertFalse(valid_number_step(6, 5/7));
-    $this->assertFalse(valid_number_step(10.3, 10.25));
-
-    // Step mismatches very close to beeing valid.
-    $this->assertFalse(valid_number_step(70 + 9e-7, 10 + 9e-7));
-    $this->assertFalse(valid_number_step(1936.5, 3e-8));
-  }
-
-  /**
-   * Tests valid_number_step() with offset.
-   */
-  function testNumberStepOffset() {
-    // Try obvious fits.
-    $this->assertTrue(valid_number_step(11.3, 10.3, 1));
-    $this->assertTrue(valid_number_step(100, 10, 50));
-    $this->assertTrue(valid_number_step(-100, 90/7, -10));
-    $this->assertTrue(valid_number_step(2/7 + 5/9, 1/7, 5/9));
-
-    // Ensure a small offset is still invalid.
-    $this->assertFalse(valid_number_step(10.3, 10.3, 0.0001));
-    $this->assertFalse(valid_number_step(1/5, 1/7, 1/11));
-
-    // Try negative values and offsets.
-    $this->assertFalse(valid_number_step(1000, 10, -5));
-    $this->assertFalse(valid_number_step(-10, 4, 0));
-    $this->assertFalse(valid_number_step(-10, 4, -4));
-  }
-}
diff --git a/core/tests/Drupal/Tests/Component/Utility/NumberTest.php b/core/tests/Drupal/Tests/Component/Utility/NumberTest.php
new file mode 100644
index 0000000..5daace5
--- /dev/null
+++ b/core/tests/Drupal/Tests/Component/Utility/NumberTest.php
@@ -0,0 +1,126 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Common\Utility\NumberTest.
+ *
+ * @see \Drupal\Component\Utility\Number
+ */
+
+namespace Drupal\Tests\Component\Utility;
+
+use Drupal\Component\Utility\Number;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests number step validation by valid_number_step().
+ */
+class NumberTest extends UnitTestCase {
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Number step validation',
+      'description' => 'Tests number step validation by valid_number_step()',
+      'group' => 'Common',
+    );
+  }
+
+  /**
+   * Tests Number::validStep() without offset.
+   *
+   * @param numeric $value
+   *   The value argument for Number::validStep().
+   * @param numeric $step
+   *   The step argument for Number::validStep().
+   * @param boolean $expected
+   *   Expected return value from Number::validStep().
+   *
+   * @dataProvider providerTestValidStep
+   */
+  public function testValidStep($value, $step, $expected) {
+    $return = Number::validStep($value, $step);
+    $this->assertEquals($return, $expected);
+  }
+
+  /**
+   * Tests valid_number_step() with offset.
+   *
+   * @param numeric $value
+   *   The value argument for Number::validStep().
+   * @param numeric $step
+   *   The step argument for Number::validStep().
+   * @param numeric $offset
+   *   The offset argument for Number::validStep().
+   * @param boolean $expected
+   *   Expected return value from Number::validStep().
+   *
+   * @dataProvider providerTestValidStepOffset
+   */
+  public function testValidStepOffset($value, $step, $offset, $expected) {
+    $return = Number::validStep($value, $step, $offset);
+    $this->assertEquals($return, $expected);
+  }
+
+  /**
+   * Provides data for self::testNumberStep().
+   *
+   * @see \Drupal\Tests\Component\Utility\Number::testValidStep
+   */
+  public static function providerTestValidStep() {
+    return array(
+      // Value and step equal.
+      array(10.3, 10.3, TRUE),
+
+      // Valid integer steps.
+      array(42, 21, TRUE),
+      array(42, 3, TRUE),
+
+      // Valid float steps.
+      array(42, 10.5, TRUE),
+      array(1, 1/3, TRUE),
+      array(-100, 100/7, TRUE),
+      array(1000, -10, TRUE),
+
+      // Valid and very small float steps.
+      array(1000.12345, 1e-10, TRUE),
+      array(3.9999999999999, 1e-13, TRUE),
+
+      // Invalid integer steps.
+      array(100, 30, FALSE),
+      array(-10, 4, FALSE),
+
+      // Invalid float steps.
+      array(6, 5/7, FALSE),
+      array(10.3, 10.25, FALSE),
+
+      // Step mismatches very close to beeing valid.
+      array(70 + 9e-7, 10 + 9e-7, FALSE),
+      array(1936.5, 3e-8, FALSE),
+    );
+  }
+
+  /**
+   * Data provider for \Drupal\Test\Component\Utility\NumberTest::testValidStepOffset().
+   *
+   * @see \Drupal\Test\Component\Utility\NumberTest::testValidStepOffset()
+   */
+  public static function providerTestValidStepOffset() {
+    return array(
+      // Try obvious fits.
+      array(11.3, 10.3, 1, TRUE),
+      array(100, 10, 50, TRUE),
+      array(-100, 90/7, -10, TRUE),
+      array(2/7 + 5/9, 1/7, 5/9, TRUE),
+
+      // Ensure a small offset is still invalid.
+      array(10.3, 10.3, 0.0001, FALSE),
+      array(1/5, 1/7, 1/11, FALSE),
+
+      // Try negative values and offsets.
+      array(1000, 10, -5, FALSE),
+      array(-10, 4, 0, FALSE),
+      array(-10, 4, -4, FALSE),
+    );
+  }
+
+}