Mastering the Calculator using the Sharp EL-531LH
37
Review calculator exercises
1. Perform the following calculations
(i)
(5 + 4)
×
3
(ii) 12.5 – 8
÷
0.5
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
(xi)
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)
Σ
x
(ii)
Σ
x
2
(iii) (
Σ
x)
2
Explain in words what each of these mean.
3
6
8
–
×
4
---------------------
12.8
16.5
3.8
–
------------------------
7
0.41
17
+
×
4
7
+
(
)
2
×
--------------------------------
2.4
3
4
---
-------
145.6
17.2
2
5
⁄
–
345.6
17.2
2
–
5
⁄
25
3
27
×
1.02 30
---------------------
+
4.1333
3.000
–
(
)
2.015
0.1366
2
6
-------------------
0.2000
2
6
-------------------
+
±
100
90
–
(
)
2
90
----------------------------
50
60
–
(
)
2
60
-------------------------
20
30
–
(
)
2
30
-------------------------
+
+
