<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><Version>2.2.0.25</Version><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><ReportLongName>14 - Disclosure - EARNINGS PER SHARE</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelColumn>false</LabelColumn><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName>1/1/2011 - 4/2/2011
USD ($)

USD ($) / shares

</KeyName><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID>Context_3ME_02-Apr-2011</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0000095029</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2011-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2011-04-02T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS><UnitProperty><UnitID>USD</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>USDEPS</UnitID><UnitType>Divide</UnitType><NumeratorMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace></NumeratorMeasure><DenominatorMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></DenominatorMeasure><Scale>0</Scale></UnitProperty><UnitProperty><UnitID>Shares</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema><MeasureValue>shares</MeasureValue><MeasureNamespace>xbrli</MeasureNamespace></StandardMeasure><Scale>0</Scale></UnitProperty></UPS><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Id="1" Label="3 Months Ended" /><Label Id="2" Label="Apr. 02, 2011" /></Labels></Column></Columns><Rows><Row><Id>2</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><Level>0</Level><ElementName>us-gaap_EarningsPerShareAbstract</ElementName><ElementPrefix>us-gaap</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><ShortDefinition>No definition available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole /><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><NonNumericTextHeader /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>No definition available.</ElementDefenition><IsTotalLabel>false</IsTotalLabel><IsEPS>false</IsEPS><Label>Earnings Per Share [Abstract]</Label></Row><Row><Id>3</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><Level>0</Level><ElementName>us-gaap_EarningsPerShareTextBlock</ElementName><ElementPrefix>us-gaap</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><ShortDefinition>No definition available.</ShortDefinition><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsSubReportEnd>false</IsSubReportEnd><IsCalendarTitle>false</IsCalendarTitle><IsTuple>false</IsTuple><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>verboselabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;NOTE 7 - EARNINGS PER SHARE&lt;/p&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; text-indent:25px;"&gt;Set forth below is a reconciliation of the numerator and denominator for basic and diluted earnings per share calculations for the periods indicated:&lt;/p&gt;
&lt;table align="center" cellspacing="0" border="0" width="100%"&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-top:1px solid black;border-bottom:1px solid black; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="4" style="vertical-align:top; border-top:1px solid black;border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;Three Months Ended&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;April 2, 2011&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;April 3, 2010&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color:#c0c0c0;"&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;Numerator:&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color:#c0c0c0;"&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; margin-left:20px;"&gt;Net income&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:bottom;text-align:right;font-style:times new roman;font-size:10pt;"&gt;$&lt;/td&gt;&lt;td style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;7,947&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:bottom;text-align:right;font-style:times new roman;font-size:10pt;"&gt;$&lt;/td&gt;&lt;td style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;8,316&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;Denominator:&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color:#c0c0c0;"&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; margin-left:30px;text-indent:-10px;"&gt;Weighted average number of common shares outstanding &amp;#8211; Basic&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;18,752,088&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;19,086,797&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; margin-left:30px;text-indent:-10px;"&gt;Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;220,201&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;253,431&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color:#c0c0c0;"&gt;
	&lt;td style="vertical-align:top; border-bottom:2px double black; border-right:1px solid black;border-left:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; margin-left:20px;text-indent:-20px;"&gt;Weighted average number of common shares outstanding &amp;#8211; Diluted&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-bottom:2px double black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;18,972,289&lt;/p&gt;
	&lt;/td&gt;
	&lt;td colspan="2" style="vertical-align:top; border-bottom:2px double black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:right;"&gt;19,340,228&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; text-indent:25px;"&gt;The dilutive effect of outstanding options and restricted stock units is calculated using the treasury stock method. The weighted average number of common shares outstanding has decreased from the comparable prior year periods as a result of the Company's stock repurchase plans. See Note 8 for further information.&lt;/p&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left; text-indent:25px;"&gt;The following average numbers of stock options are anti-dilutive and therefore are not included in the diluted earnings per share calculation:&lt;/p&gt;
&lt;table align="center" cellspacing="0" border="0" width="100%"&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-top:1px solid black;border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:top; border-top:1px solid black;border-bottom:1px solid black; border-right:1px solid black;" colspan="2"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;Three Months Ended&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
	&lt;td style="vertical-align:top; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;&amp;#160;&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;April 2, 2011&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:top; border-bottom:1px solid black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;April 3, 2010&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="background-color:#c0c0c0;"&gt;
	&lt;td style="vertical-align:top; border-bottom:2px double black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:left;"&gt;Average number of stock options&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:top; border-bottom:2px double black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;-&lt;/p&gt;
	&lt;/td&gt;
	&lt;td style="vertical-align:top; border-bottom:2px double black; border-right:1px solid black;"&gt;
&lt;p style="font-style:times new roman;font-size:10pt;text-align:center;"&gt;256,250&lt;/p&gt;
	&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;</NonNumbericText><NonNumericTextHeader>NOTE 7 - EARNINGS PER SHARE
Set forth below is a reconciliation of the numerator and denominator for basic and diluted earnings per share calculations for the</NonNumericTextHeader><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios></Cell></Cells><OriginalInstanceReportColumns /><Unit>Other</Unit><ElementDataType>us-types:textBlockItemType</ElementDataType><SimpleDataType>string</SimpleDataType><ElementDefenition>This element may be used to capture the complete disclosure pertaining to an entity's earnings per share.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 128
 -Paragraph 40

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