Using a calculator 23
Figure 4.1 A Casio fx-83ES calculator
Now try the following Practice Exercise
Practice Exercise 12 Addition, subtraction,
multiplication and division using a calculator
(answers on page 341)
1. Evaluate 378.37 − 298.651 + 45.64 − 94.562
2. Evaluate 25.63 × 465.34 correct to 5 significant figures.
3. Evaluate 562.6 ÷ 41.3 correct to 2 decimal
places.
4. Evaluate
17.35 × 34.27
41.53 ÷ 3.76
correct to 3 decimal
places.
5. Evaluate 27.48 + 13.72 × 4.15 correct to
4 significant figures.
6. Evaluate
(4.527 + 3.63)
(452.51 ÷ 34.75)
+ 0.468 correct
to 5 significant figures.
7. Evaluate 52.34 −
(912.5 ÷ 41.46)
(24.6 − 13.652)
correct to
3 decimal places.
8. Evaluate
52.14 × 0.347 × 11.23
19.73 ÷ 3.54
correct to
4 significant figures.
9. Evaluate
451.2
24.57
−
363.8
46.79
correct to 4 significant figures.
10. Evaluate
45.6 − 7.35 × 3.61
4.672 − 3.125
correct to 3
decimal places.
4.3 Further calculator functions
4.3.1 Square and cube functions
Locate the x 2 and x 3 functions on your calculator and
then check the following worked examples.
Problem 3. Evaluate 2.4 2
(i) Type in 2.4
(ii) Press x 2 and 2.4 2 appears on the screen.
(iii) Press = and the answer
144
25
appears.
(iv) Press the S ⇔ D function and the fraction
changes to a decimal 5.76
Alternatively, after step (ii) press Shift and = .
Thus, 2.4 2 = 5.76
Problem 4. Evaluate 0.17 2 in engineering form
(i) Type in 0.17
(ii) Press x 2 and 0.17 2 appears on the screen.
Figure 4.1 A Casio fx-83ES calculator
Now try the following Practice Exercise
Practice Exercise 12 Addition, subtraction,
multiplication and division using a calculator
(answers on page 341)
1. Evaluate 378.37 − 298.651 + 45.64 − 94.562
2. Evaluate 25.63 × 465.34 correct to 5 significant figures.
3. Evaluate 562.6 ÷ 41.3 correct to 2 decimal
places.
4. Evaluate
17.35 × 34.27
41.53 ÷ 3.76
correct to 3 decimal
places.
5. Evaluate 27.48 + 13.72 × 4.15 correct to
4 significant figures.
6. Evaluate
(4.527 + 3.63)
(452.51 ÷ 34.75)
+ 0.468 correct
to 5 significant figures.
7. Evaluate 52.34 −
(912.5 ÷ 41.46)
(24.6 − 13.652)
correct to
3 decimal places.
8. Evaluate
52.14 × 0.347 × 11.23
19.73 ÷ 3.54
correct to
4 significant figures.
9. Evaluate
451.2
24.57
−
363.8
46.79
correct to 4 significant figures.
10. Evaluate
45.6 − 7.35 × 3.61
4.672 − 3.125
correct to 3
decimal places.
4.3 Further calculator functions
4.3.1 Square and cube functions
Locate the x 2 and x 3 functions on your calculator and
then check the following worked examples.
Problem 3. Evaluate 2.4 2
(i) Type in 2.4
(ii) Press x 2 and 2.4 2 appears on the screen.
(iii) Press = and the answer
144
25
appears.
(iv) Press the S ⇔ D function and the fraction
changes to a decimal 5.76
Alternatively, after step (ii) press Shift and = .
Thus, 2.4 2 = 5.76
Problem 4. Evaluate 0.17 2 in engineering form
(i) Type in 0.17
(ii) Press x 2 and 0.17 2 appears on the screen.