diff --git a/Classes/PHPExcel/Calculation/MathTrig.php b/Classes/PHPExcel/Calculation/MathTrig.php
index 9f0e7f4..f3ae111 100644
--- a/Classes/PHPExcel/Calculation/MathTrig.php
+++ b/Classes/PHPExcel/Calculation/MathTrig.php
@@ -145,8 +145,8 @@ class PHPExcel_Calculation_MathTrig {
 			$significance = $number/abs($number);
 		}
 
-		if ((is_numeric($number)) && (is_numeric($significance))) {
-			if ($significance == 0.0) {
+        if ((is_numeric($number)) && (is_numeric($significance))) {
+            if (($number == 0.0 ) || ($significance == 0.0)) {
 				return 0.0;
 			} elseif (self::SIGN($number) == self::SIGN($significance)) {
 				return ceil($number / $significance) * $significance;
@@ -316,10 +316,9 @@ class PHPExcel_Calculation_MathTrig {
 		}
 
 		if ((is_numeric($number)) && (is_numeric($significance))) {
-			if ((float) $significance == 0.0) {
-				return PHPExcel_Calculation_Functions::DIV0();
-			}
-			if (self::SIGN($number) == self::SIGN($significance)) {
+            if (($number == 0.0 ) || ($significance == 0.0)) {
+				return 0.0;
+			} elseif (self::SIGN($number) == self::SIGN($significance)) {
 				return floor($number / $significance) * $significance;
 			} else {
 				return PHPExcel_Calculation_Functions::NaN();
diff --git a/changelog.txt b/changelog.txt
index 6a5bb81..0b8845f 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -37,6 +37,7 @@ Planned for v1.8.1
 - Bugfix:   (frozenstupidity) Work Item GH-423  - Fix invalid NA return in VLOOKUP
 - Bugfix:   (wiseloren)       Work Item CP21454 - "No Impact" conditional formatting fix for NumberFormat
 - Bugfix:   (bobwitlox)       Work Item GH-467  - Bug in Excel2003XML reader, parsing merged cells
+- Bugfix:   (MBaker)          Work Item GH-302  - Fix for CEIL() and FLOOR() when number argument is zero
 - General:  (MBaker)                            - Small performance improvement for autosize columns
 - General:  (frost-nzcr4)     Work Item GH-379  - Change the getter/setter for zeroHeight to camel case
 - General:  (MBaker)          Work Item GH-394  - DefaultValueBinder is too much aggressive when converting string to numeric