Penny is the singular but both pence and pennies are plural. Pence is used for amounts of money ( two pounds and fifty pence) but pennies refers to the physical coins ( I put two pennies in the bowl). There are also other units of measuring pence as coins which are no longer used like tuppence and sixpence. There are many expressions with penny and pennies such as - "find a penny, pick it up, and all the day you'll have good luck", "a pretty penny", "to spend a penny" or "in for a penny, in for a pound". Pinchpenny is an adjective meaning stingy.. I've never heard of pinch pennies though.

'Penny' is the singular form. 'Pennies' is the plural, to refer to physical coins. 'Pence' preceded by a number, is the plural when referring to a price. This is the modern usage. You may find these words used differently in older texts. 1. If you are talking about a price, you can say 'It's 50 cents', but you can't say 'It's fifty pennies'. The plural 'pennies' refers to the metal coins themselves. You might say, for example 'I found some old Victorian pennies in my grandmother's attic.', if you are talking about the physical objects. Pennies and cents are not the same thing, of course. In the UK, a penny is our smallest unit of currency - a penny is one hundredth of a pound sterling. In other countries, such as those that have euros or dollars, the smallest unit is a cent. In these countries, residents may refer to pennies colloquially, or in idiomatic phrases. 2. Yes, in the UK you can say 'It's 50 pence', or you could also write this as 50p (pronounced 'fifty pea') 3. No, not for a price. A 'piece' refers to the the object itself, not the price. For example, you could say 'I put a 50 pence piece in the vending machine.' or 'Does anyone have change for a fifty pence piece?'. A. pinch penny ---> I've never heard of this expression. B. a penny pincher --> a miserly person. There is also 'penny pinching', which means being miserly or unwilling to spend money C It's worth every penny of it --> This just means that something is definitely worth the money spent on it.