1. 38 = thirty eight = treinta y ocho
2. 116 = one hundred sixteen = ciento dieciséis
3. 573 = quinientos setenta y tres
4. 1,821 = one thousand eight hundred twenty one = mil ochocientos veintiuno
5. 754,322 = seven hundred fifty four thousand three hundred twenty two = setecientos cincuenta y cuatro mil trescientos veintidós
6. 6,615,010 = six million six hundred fifteen thousand ten = seis millones seiscientos quince mil diez