Casio FX-82AU PLUS Manuale Utente
21
Percentages
1 The screen shot shows the calculator converting 25% to a fraction.
Enter 25% by pressing 25SHIFT( followed by p to check the value of
25% as a fraction.
25% as a fraction.
2 Express each percentage as a fraction.
A 50%
B 75%
C 40%
D 5%
E 100%
F 200%
G
1
2
2
%
H 1.5%
I
1
4
4
%
J 35%
3 Express each percentage as a decimal.
Hint! Express the percentage as a fraction then press the n button.
A 45%
B 79%
C 5%
D 7.5%
E
1
2
2
%
F 245%
G 1000%
H 1%
I 120.5%
J
1
11
2
%
4 The screen shot shows the solution to the problem ‘Increase 40 by 10%’.
Check the calculation by pressing 40+10SHIFT(O40p.
Determine the following amounts.
A Increase 60 by 10%.
B Increase 75 by 25%.
C Decrease 80 by 20%. (Hint! Remember decrease means make smaller.)
D Decrease $120 by 30%.
E Increase $90 by 25% then decrease the result by 25%.
A Increase 60 by 10%.
B Increase 75 by 25%.
C Decrease 80 by 20%. (Hint! Remember decrease means make smaller.)
D Decrease $120 by 30%.
E Increase $90 by 25% then decrease the result by 25%.
5 The local sports store is having a ‘15% off sale’. Gillian is going to buy a pair of
running shoes that normally cost $165. How much will the running shoes cost in
the ‘15% off sale’?
the ‘15% off sale’?
Answers
2A
2A
1
2
2
B
3
4
4
C
2
5
5
D
1
20
E 1 F 2 G
1
200
H
3
200
I
1
400
J
7
20
3A 0.45 B 0.79 C 0.05 D 0.075 E 0.025 F 2.45 G 10 H 0.01 I 1.205 J 0.115
4A 66 B 93.75 C 64 D $84 E 84.375
5 $140.25
4A 66 B 93.75 C 64 D $84 E 84.375
5 $140.25
© Sue Thomson and Shriro Australia PTY Limited. This page may be photocopied for classroom use.