You spelled amount correctly. Example: The cashier gave me the wrong amount of change.
As in a small amount - Smidge.
Entirety is the correct spelling (the whole amount).
That is the correct spelling of the word "pinch" (to tweak, or a small amount).
The currency amount $4.18 is "four dollars and eighteen cents."
The correct spelling is principal and interest. The principal is normally the amount borrowed, which is reduced by paying any amount exceeding the interest.
Forty
As in a small amount - Smidge.
It is spelled 'measly'.
The correct spelling is "multiply" (to increase an amount).
Entirety is the correct spelling (the whole amount).
Substantial.
That is the correct spelling of "quantitative" (based on a physical amount).
The currency amount $68 is "sixty-eight dollars."
That is the correct spelling of the word "pinch" (to tweak, or a small amount).
Un poco. Una pequeña cantidad.
The currency amount $68.00 is "sixty-eight dollars" (and no cents).
The likely word sought is "mortgage" (owed amount on property).