How Much Must We Take Away From Ten to Get Three?

Teaching will be essentially enhanced and vivified if, in a similar way, you reverse the other simple forms of calculation to day. What we must first contribute is the abstract part in the middle. When we do things this way, things are directly adapted to life. If i have seven, how much must i take away to get three? Instead of what is left after take four away from seven? Having seven is the real thing, and what i have left is equally real. These are realities. Later we find our way back to the ordinary sum total.