One of the fundamental problems with learning mathematics is that while the number sense may be (i)____________, exact calculation requires cultural tools – symbols and algorithms – that are relatively new and must therefore be absorbed by areas of the brain designed for other purposes, which is easier when what we are learning (ii)____________ our built-in circuitry. With an understanding of it, we can at least (iii)____________ our teaching methods by reflecting on the constraints it imposes. A. innate B. harmonizes with C. preserve D. modern E. intrudes on F. discard G. complex H. goes beyond I. adapt