Sure through them in too... and let not stop there... let's add complex numbers, quaternions, octonions and sedonions... you can go further, but complex-based algebras beyond the octonions are basically irrelevant and lack important mathematical properties like unique quotents.
My favorite is quaternions, though... They're so pretty. 3-D imaginary numbers make a perfect compliment to 3-D quantum physics. I only wished we had used it when I was in school. Damn profs were so concerned with their traditional algebra and "bra - ket" notation.
Anyway, with quaternions, we'd get 10.4.(a + b i + c j + d k)
-Clive