There are two accepted plural forms of the noun memorandum:
memoranda and memorandums.
The plural possessive forms are memoranda's and memorandums'.
Examples:
The memoranda's file is alpha by last name of sender.
The memorandums' file is alpha by last name of sender.
The plural possessive of memorandum is memoranda's.
The plural of memorandum is memoranda.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The correct plural for memorandum is memoranda, but memorandums is also accepted.
Memoranda is the plural form of memorandum.
The plural of memorandum is memoranda.
The noun memorandum is singular; the plural forms are memoranda or memorandums.
"Memoranda" is the correct plural form of "memorandum."
The plural form is memorandums of transfer.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
Memoramdum is singular, the plural is memoranda or memorandums
The correct form is "its" for the possessive form in the plural. "Its" is used for both the singular and plural possessive forms, without an apostrophe.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.