Numbers 100~
We say 100 as “hyaku”.
101: hyaku-ichi
Since 101=100+1, you can simply read 100 and 1 without “+”
In the same way,
102: hyaku-ni
103: hyaku-san
104: hyaku-yon
110: hyaku-jyuu
111: hyaku-jyuu-ichi *111=100(hyaku)+10(jyuu)+1(ichi)
How about 213?
Since 243=2×100+4×10+3
You can merely read 2(ni),100(hyaku), 4(yon),10(jyuu) and 3(san)
Ni-hyaku-yon-jyuu-san
Did you get this?