Flanker

Hello, I have a question about the change of radix, for example: Convert 1020304 base 10 into base 7: 1020304 / 7 = 145757 r 5 145757 / 7 = 20822 r 3 20822 / 7 = 2974 r 4 2974 / 7 = 424 r 6 424 / 7 = 60 r 4 60 / 7 = 8 r 4 8 / 7 = 1 r 1 1 / 7 = 0 r 1 => 11446435 There is a tip to divide a big number with a little number?, is posible with a simple calculator get the remainders from a divition like that?