There is only one plural for criterion, which is criteria.
Plurals for six is simply sixes. Two sixes. Mathew :)
Plurals don't use apostrophes, so the first one is correct.
The singular possessive form of criterion is criterion's
Compound Criterion
The plurals can normally be indicated by 5s (fives) and 7s (sevens). Numerals and single letters were once accepted as exceptions to the rule that apostrophes do not form plurals.
There are two plurals, either hippopotamuses or hippopotami
The plural of automaton is automatons or automata
plurals and possessive
The plurals for Mrs Vandertramp are Mmes Vandertramp or Mesdames Vandertramp.
Nouns form their plurals in different ways depending on the noun. For most nouns, you add "-s" or "-es" to the end (e.g., cat - cats, box - boxes). Some nouns have irregular plural forms that do not follow this rule (e.g., child - children, tooth - teeth).
Plurals for six is simply sixes. Two sixes. Mathew :)
Plurals don't use apostrophes, so the first one is correct.
There are two acceptable plurals - memorandums of understanding and memoranda of understanding.
The singular possessive form of criterion is criterion's
AND criterion
Nouns ending in 'y' preceded by a vowel form their plurals by adding the letter 's'. Examples:one day, two daysone boy, two boysone play, two playsone blue-jay, two blue-jays
pluralsThe word plurals is the plural of plural. As in: I answered the question about plurals to the person who didn't know that the plural of plural is plurals.