Not unless you're using a contraction of the words three and is.
Example:
Three's company! = Three is company
Or if you're using it as a pronoun to show possession.
Example:
Those three's clothes always match!
There are 4
27 threes are in 81
There are four threes in a standard deck of cards.
To find out how many threes are in 21, you divide 21 by 3. This calculation gives you 21 ÷ 3 = 7. Therefore, there are seven threes in 21.
To determine how many threes go into 27, you divide 27 by 3. The calculation is 27 ÷ 3 = 9. Therefore, there are 9 threes in 27.
Business'
No, you do not need to put an apostrophe in the word "hundreds" unless you are indicating a contraction or possession.
there is no apostrophe in the word cyclist.
With the word 'men' you would put the apostrophe between 'men' and 's'.
If you mean as an abbreviation of 'old', then the apostrophe would be at the end of the word (ol'), because the apostrophe shows that the 'd' at the end of the word has been omitted.
you put an apostrophe after the N and before the T.
Use an apostrophe after the word actors if it indicates possession. Example: actors' guild
An apostrophe ( ' ) is put after a word to shorten and abbreviate a word , e.g. the printer's ink
yes
It means there is already an "s" at the end of the word
No, the word "grandparents" does not require an apostrophe. The plural form is used without any punctuation marks.
The apostrophe in the word "Texas" is placed before the "s" to indicate possession (e.g. Texas's economy).