You write it: twelve
Twelve.
It is twelve hundred.
twelve million
So for example if you wanted to write 4 in words it would be four.
.12 in words is twelve hundredths.
You write it: twelve
twelve
Twelve.
It is twelve hundred.
twelve million
Twelve
To write 12 more than B, you would write the expression as B + 12. This means you are adding 12 to the value of B.
So for example if you wanted to write 4 in words it would be four.
Ten thousand one hundred thirty-nine millionths.
twelve
Twelve twenty-one.