Ten million five hundred twelve thousand and fifteen as a numeral is 10,512,015
When you write a check in pesos, you write out the amount. You can write fifteen thousand pesos under the payee. On the right, you write out 15,000.
one hundred : 100fifteen thousand : 15 000fifteen thousand one hundred : 15 100
The standard form is 12,300,215
Twelve thousand and twelve thousandths written as a decimal is 12000.012