Casio Fx82LB Manual

							36  Mastering the calculator using the Casiofx-82LB 
						

							Mastering the calculator using the Casiofx-82LB  37
Calculator Solutions
1.
(i) (5 + 4) × 3= 27
Make sure your calculation is in comp mode.
(ii) 12.5 – 8 ÷ 0.5 = -3.5
(iii)= 2.5
Either (3 × 6 – 8) ÷ 4 =, or 3 × 6 – 8 = ÷ 4 =
(iv)= 1.007874
Either 12.8 ÷ (16.5 – 3.8) =, or 16.5 – 3.8 = SHIFT  × 12.8 =
(v)= 0.9
Either ... ÷ ((4 + 7) × 2) = or ... ÷ (4 + 7) ÷ 2 =
(vi)= 3.2
Either 2.4 ÷ (3 ÷ 4) =, or 2.4 ÷ 3 ab/c 4 = 
(vii)= 9.296..
Either 145.6 – 17.2x2 ÷ 5 = √ 
(viii)= 1.41..
Either 345.6 – 17.2x2 = √ ÷ 5
(ix)= 39.4985
25 + 3 × 27 ÷ 1.02 ÷ 30 √ =
(x)= 1.3325 or 0.9341
Calculator keys: 0.1366 x2 ÷ 6 + .2 x2 ÷ 6 = √ x 2.015 = Min
+ 4.1333 – 3 
= MR ± + 4.1333 – 3 =
368–×
4---------------------
12.8
1
6.5 3.8–------------------------
1
x ---
70.417+×
47+ ()
2×-----------------------------
2.4
3
4 -- - -
------
145.6 17.225⁄ –
345.6 17.22–5⁄
25327×
1.02 3
0---------------------+
4.1333 3.000– ()2.0150.1366
2
6 -------------------0.2000
2
6 -------------------+ ± 
						

							38  Mastering the calculator using the Casiofx-82LB
(xi)= 6.1111
Calculator keys: (100 – 90) x2 ÷ 90 + (50 – 60) x2 ÷ 60 + (20 – 30) x2 ÷ 30 =
2. The following data is on growth (in $m) in an economy over a 8 year period:
2.5 6.2 -2.1 0.04 8.2 7.4 2.1 -1.7
Calculate (i) Σx(ii) Σx2(iii) (Σx)2 Explain in words what each of these mean.
To do this on the calculator, you must be in SD mode. Enter the data:
mode 2 2.5  M+  6.2  M+  2.1  (–)  M+  .04  M+  8.2  M+  7.4  M+  2.1  M+  1.7  (–)  M+
(i) 22.64 Press the key that says Σx ()
This gives the total growth over the last 8 years
(ii) 178.4016 Press the key that says Σx2 () This gives the sum of 
the squares of the growth in each year
(iii) 512.5696 Press Σx and shift x2. This gives the square of the sum of the 
growth.
100 90– ()2
90----------------------------50 60– ()
2
60 -------------------------20 30– ()
2
30 -------------------------++