Summary of MENTOR GRAPHICS CORP

Item 2.02 Results of Operations and Financial Condition.

Attached as Exhibit 99.1 to the original Form 8-K filed earlier on May 29, 2009 is a copy of a press release of Mentor Graphics Corporation dated May 29, 2009, announcing the Company's financial results for the first quarter of fiscal year 2010 and the Company's outlook for the second quarter of fiscal year 2010, which was furnished to the Securities and Exchange Commission. Set forth below are reconciliations of GAAP total expenses to non-GAAP total expenses for the three months ended April 30, 2008 and 2009.

                          MENTOR GRAPHICS CORPORATION

   UNAUDITED RECONCILIATION OF GAAP FINANCIAL MEASURES TO NON-GAAP FINANCIAL
                                    MEASURES

                                 (In thousands)



                                                            Three Months Ended
                                                                 April 30,
                                                            2009          2008
     GAAP cost of revenues                                $  29,040     $  33,862
     GAAP operating expensesa                               170,881       176,010

     GAAP total expenses                                    199,921       209,872

     Reconciling items to non-GAAP total expenses:
     Equity plan-related compensation                        (7,770 )      (6,551 )
     Prepaid royalty costs                                       -           (103 )
     Amortization of other identified intangible assets      (5,818 )      (5,671 )
     Rebalance, restructuring, and other costs               (5,695 )      (9,650 )

     Non-GAAP total expensesa                             $ 180,638     $ 187,897

a Adjusted for the reclassification of the French research and development credit.