HP HP-35 - Page 9

Why not check and see just how close 356/ 11 3 does
approximate 11? Although the rest 01 this manua l must be
read, JUSt between the IWO of us, you can't hurt Ihe
calculator by sliding the power switch to ON and pressing
a lew keys,
To check the appr oxima tion, key in 355, then press
IDJiiIl and key in the denominator, 113, N<m press
a to gel Ihe quo l ienl, Theapproximation is n<min the
display, Let us now subtract the Irue value of 11 !to len
significant digits)
from the appr oximatio n. Press @ and
11:1 It's closer than one would think 12.66 x 10-
7
). To
f,nd
the percent error, divide thos difference bv 11 and
mu ltiplv by 100. (@' 1:1 ' 100, f3 ), We n ow k now
tha t 355/113 appro x imates 71' to wi thin 8.47 mi llionths of
one percent, !It makes 22n look pretty 5a(U T wo final
comments: <D it 's easy to r emembe r the approximation
Deca use it ,s made by dupic ating the first three odd
numbers and insert,ng a div'sion si!1l in the middle:
113}355; ® you have just evaluated the expression
1355/1 13 - 7l'l X 1100/71'). Congratulation sl By the way,
switch the calculator off and put ,t iNlay, (You are nOt
supposed 10 know how to work il , , . vet).
iii