how many integers between 314,700 and 458,600 have tens digit 1 and units digit 3 ?
"there is one number in hundred with 1 in the tens digit and 3 in the units digit : 13 , 113 , 213 , 313 , . . . the difference between 314,700 and 458,600 is 458,600 - 314,700 = 143,900 - one number per each hundred gives 143,900 / 100 = 1,439 numbers . answer : e ."
subtract(458,600, add(add(multiply(const_2, const_100), multiply(add(const_3, const_4), const_10)), const_2))