Loan Participation Calculation

							Product Overview: Giant PC Disclosure Calculations
Following are the disclosure calculations for Giant                             these and other disclosed attributes before investing
Participation Certificate (PC) securities. Some of these                        in Freddie Mac securities. Please direct all inquiries or
calculations incorporate assumptions as to permitted                            questions relating to Freddie Mac mortgage-backed
mortgage characteristics and variables therein. As                              securities to an Investor Inquiry representative at
a result, in some cases the application of these                                (800) 336-3672.
calculations could result in minor differences between
the actual characteristics of a given mortgage and the                          Disclosure is available on Freddie Mac’s Web site at
reported characteristics. Freddie Mac may change                                www.FreddieMac.com/mbs. The following information
the calculation methods and the type of information                             is updated from loan-level data for all active loans in the
provided. It is important for investors to understand                           corresponding Giant pool on a monthly basis.




 Attribute        Description                                                      Disclosure Calculation

 Weighted         The weighted
 Average          average of the
                                                                                          Giant WAC =
 Coupon           current note rate
 (WAC)            of the mortgages
                  in a Giant PC.                               Sum of (Loan Participation Percent x Loan UPB x Loan Note Rate)

                                                                        Sum of (Loan Participation Percent x Loan UPB)


 Weighted         The weighted
 Average          average of the
                                                                                         Giant WARM =
 Remaining        current note
 Maturity         remaining months
 (WARM)           to maturity of the                  Sum of (Loan Participation Percent x Loan UPB x Loan Remaining Month to Maturity)
                  mortgages in a                                        Sum of (Loan Participation Percent x Loan UPB)
                  Giant PC.


 Weighted         The weighted
 Average          average of the
 Loan Age         number of months                                                       Giant WALA =
 (WALA)           since the date of
                  note origination of                             Sum of (Loan Participation Percent x Loan UPB x Loan Age)
                  the mortgages in
                                                                        Sum of (Loan Participation Percent x Loan UPB)
                  a Giant PC.


 Weighted         The weighted
 Average          average of the
 Original         UPBs, as of the                                                       Giant WAOLS =
 Loan Size        note date, of the
 (WAOLS)          mortgages in a               Sum of (Loan Participation Percent x Loan UPB x Original Loan Amount rounded to the nearest 1000)
                  Giant PC.
                                                                        Sum of (Loan Participation Percent x Loan UPB)


 Average
 Original Loan
                                                                                         Giant AOLS =
 Size (AOLS)*
                                                                        Sum of (Original Loan Amount Rounded to 1000)

                                                                                       Number of Loans


 *AOLS is not a weighted average, but a simple average. It does not include the impact of contribution percentage of pools within a Giant.



                                                                                                                                                   March 2009