The point of the pi calculation is not to make bicycle wheels. pi/10 gives the same value as pi to 32 decimal places. Pi is an "irrational" number; some type of numerical technique is needed to approximate its value. These days, of course, the approximation is done using a computer. It is amazing that a simple mantra can do exactly what a computer does, yielding the exact same result: It has a self-contained master-key for extending the evaluation to any number of decimal places.
ka, ta, pa, and ya all denote 1; kha, tha, pha, and ra all represent 2; ga, da, ba, and la all stand for 3; Gha, dha, bha, and va all represent 4; gna, na, ma, and sa all represent 5; ca, ta, and sa all stand for 6; cha, tha, and sa all denote 7; ja, da, and ha all represent 8; jha and dha stand for 9; and ka means zero.