Ceacht 21:
cá/cé mhéad?	how much?	question phrase	
pingin	a penny	n. f2	
scilling	a shilling	n. f2	
punt	a pound ( money / weight)	n. m1.	
réal	a sixpence	n. m1	
tá scilling air	it costs a shilling	[v. ] + [n. f. ] + [prep. pron.]	
bhí scilling air	it cost a shilling	[v. ] + [n. f. ] + [prep. pron.]	
dhá phingin	two pennies	numeral + [n. f2  # len. #]	
trí phingin	three pennies	numeral + [n. f2  # len. #]	
ceithre phingin	four pennies	numeral + [n. f2  # len. #]	
cúig phingin	five pennies	numeral + [n. f2  # len. #]	
sé phingin	six pennies	numeral + [n. f2  # len. #]	
dhá scilling	two shilling	numeral + [n. f2]	
dhá phunt	two pounds	numeral + [n. m1 # len.#]	
ceithre phunt	four pounds	numeral + [n. m1 # len. #	
sin an méid	that's all	[pron.] + [ art. ] + [ n. m4]	
aon rud eile	anything else	[determ.] + [n. m3] + [determ.]	
más é do thoil é	please	[ conj. (  + copula ) ] + [pron. ]  +  [ prep. pron.] +[n. f3 #len.#] +[pron]	

Tá scilling air:  This literally means "There's a shilling on it". air = ar (on) + sé (it)

Counting. In the grammar notes for lesson 20 the numbers 0 – 10 were listed.  Now we see how to use numbers together with a noun
The numbers 1 - 6 cause lenition of the noun and the numbers 7 - 10 cause eclipsis.** 

Note: nouns beginning with sc-, sf-, sm-, sp-, st- or sv- are never subject to lenition.

The singular form of most nouns is used when counting.
1  penny	= (aon) p(h)ingin amháin	: 1 shilling 	= (aon) scilling amháin *
2  pennies 	= dhá phingin			: 2 shillings 	= dhá scilling
3  pennies 	= trí phingin			: 3 shillings 	= trí scilling
4  pennies 	= ceithre phingin		: 4 shillings 	= ceithre scilling
5  pennies 	= cúig phingin			: 5 shillings 	= cúig scilling
6  pennies 	= sé phingin			: 6 shillings 	= sé scilling
7  pennies 	= seacht bpingin		: 7 shillings 	= seacht scilling
8  pennies 	= ocht bpingin			: 8 shillings 	= ocht scilling
9  pennies 	= naoi bpingin			: 9 shillings 	= naoi scilling
10 pennies 	= deich bpingin		: 10 shillings 	= deich scilling

*: To say "one penny" instead of "a penny" it is preferable to use the word amháin after the noun, which basically means "one". The word aon is optional, so you can just say "pingin amháin."

**: The words 'euro' and 'cent' are exceptions in Irish, in that they do not change in the singular or plural. Nor do they take a 'h' (lenition) or eclipsis (urú). In addition, they are pronounced in Irish the same as they are in English, i.e. as if they were written: 'iuró' agus 'sent'.