I spell them correctly.
one
English
12
10,000,000,000,000 I think
Uno-cincuenta
one through eight
101,102, ....200
You can't spell numbers but there are a few tricks to say them in different way like this: 1= 'I' or won 2='II" or too 3='III" or tri ..... etc
You can visit the link below for 1 to 100 numbers in Marathi.
When you spell out the words for numbers 1-10 four of the numbers have three letters. (one two six ten)
spell HELLO, you will reverse the numbers so that they read 0.7734.
One and ten million. It would take up far too much time to spell the lot.