## MATHEMATICS NOTES FORM FIVE:CALCULATING DEVICES

### MATHEMATICS NOTES FORM FIVE:CALCULATING DEVICES

Monday, April 13, 2020

MATHEMATICS NOTES FORM FIVE:CALCULATING DEVICES

UNAWEZA JIPATIA NOTES ZETU KWA KUCHANGIA KIASI KIDOGO KABISA:PIGA SIMU:0787237719

## MATHEMATICS NOTES FORM FIVE:CALCULATING DEVICES

CALCULATING DEVICES

Operations with the scientific calculator

a)  375 + 601 = 976

b)  401 + 2801 + 70120 + 3 = 73, 325

c)  0.0175 + 2.561 + 3.8976 = 6.4761

2. Subtraction

a)     2890 – 576 =2314

b)     215 – 891 = -676

c)     7510 – 204 – 79 = 7227

3. Division

a) 591 ÷ 27 = 21.889

b) 79775 ÷ 4795 = 16.62671947

4. POWERS (^)

a) 28 = 256

b) 49 = 262,144

c) 93 = 729

d) 4292 = 184,041

4. Multiplication

a) 7694 x 21 = 161,574

6. Roots

i) Square roots

a)

b)

c)

ii) Cube root

a)

b)

iii) nth Root

a)

b)

Note:

Also

EXAMPLE

a) Use your calculator to find the value of

1.

2.

3.

4.

5.

6.

b)        Evaluate to 3 decimal places

i)

ii)

c) Find the value of A given by the formula  if P = 126, r = 4 and n = 5

Solution

d) The area of a triangle is given by   where 2s = a + b + c. Find the area of a triangle given that a = 14.2, b = 12.6 and c = 8.4

Solution

a + b + c = 2s

14.2 + 12.6 + 8.4 = 2s

Power of e

i)   Calculate

a) 2 = 7.389056099

b) 5 = 148.4131591

c)  = 1.947734041

Logarithm function

Example

1.    = 0.69897

2.    = 2.321928095

Natural Logarithm x

1.

2.

Trigonometrical function

1.   Sin 300 = 0.5

2.   Sin 300 27’ = 0.506786256

3.   Cos-1  = 600

QUESTION

1.         correct to 6 decimal places

2.        correct to 3 decimal places

3.        correct to 4 decimal places

4.      correct to 6 decimal places

5.             correct to 4 decimal place

6.                correct to six decimal places

7.

8.      correct to five decimal places

9.           correct to six decimal places

10.        correct to six decimal place

11.            correct to six decimal places

12.       correct to five decimal places

1.    1.667812

2.     351.886

3.      1.6283

4.     3.033894

5.      1.4868

6.     0.245465

7.

8.        0.37881

9.       1.226122

10. 2.995246

11. 1.3

12. 0.0

CONVERSION OF ANGLES FROM DEGREES TO RADIANS AND THE  OPPOSITE

EXAMPLE

1.      Convert 180° to radian

2.     Convert 1.57 rad to degrees

= 89.95437384

Statistical functions

Question

1.  Find x , , x  n – 1. Using your calculator for the following number 16, 22, 10

Solution:   = 48

= 16

x n -1 = 6

2.  Find , , x n – 1, using your calculator for the following numbers  19, 11, 12, 20

Solution

=62

= 15.5

X  n – 1 = 4.65

QUESTION

1.   Change the following angles to radians

i) 90° = 1.57 rad

ii) 210°= 3.67 rad

iii) 60° = 1.05 rad

iv) 360° = 6.28 rad

2.  Change the following radians to angles

i) 1.732 rad= 99.24

ii) 3.12 rad = 178.76

iii) 6.28 rad =359.82

iv) 0.5 rad =28.65

3.  Calculate the following 24° 8’ + 85.34 rad – 60° 31’

4.  Using statistical functions from your calculator. Find ,  , n -1

i) 1, 3, 4, 4, 8

n -1= 2.55

ii)  0.1, 2.4, 0.8, 1     =4.3 ,  =1.075 ,   n -1 = 0.9639

iii) 0.9, 2.9, 3.9, 3.9, 7.9  n -1=2.55

iv) 17, 18, 20, 22, 23    ,   n -1= 2.55

v) -10,-5, 5, 15, 20,      ,   n -1= 127.5

vi)  17, 17, 17, 17, 21, 21, 25, 25, 26      ,   n -1= 3.87

vii) 9.81, 9.81, 9.82, 9.82, 9.18, 9.18, 9.18, 9.84, 9.84, 9.84    ,   n -1= 0.011

More questions

1.    Calculate the following

i)  Correct to four decimal places ….   -1.751365301  1.7514

ii)   Correct to 4 decimal places… 0.855861129

2.   Find ,   ,x n – 1 of 64, 44, 56 and 66…   ,   n -1=9.98

3.   Calculate

i)       Correct to 4 decimal places

ii)       Correct to 6 decimal places

iii)            Correct to 5 decimal places

Examples

1.         Find ,   , n – 1. For the following frequency distribution

 X 61 64 67 70 73 F 5 18 42 27 8

Solution

= 6,745

= 67.45

n – 1 = 2.93

2.   i) Calculate ,   , n – 1 for the following data

 X 62 63 64 65 66 67 68 69 70 71 72 F 25 35 52 84 120 135 101 61 40 33 14

= 46,736

= 66.77

n – 1 = 2.29

iii)

 X 1 2 3 F 0.5 0.33 0.25

= 1.91

= 1. 77

n -1 = 2.94

iv)

 X 9 12 15 18 21 24 27 30 33 36 F 12 10 15 19 12 14 3 0 4 1

= 1632

= 18.13

n – 1 = 6.31

i) Degree and minutes

i) 25° 11’ + 20.6 rad – 55’

= 25° 11’ + 1, 180.29° – 55

= 1204° 33’

ii) 0.8rad + 16.4° + 73.8rad – 120° 54’

= 4169° 45’

iii) 71° 41’ 22’’ + 29.8rad – 16.4°

= 71° 41’ 22’’ + 1,707.41° – 16.4°

= 1762° 41’

3.        Calculate the following

i)                           Correct to 6 decimal place

= 1.027684683

≈ 1.027685

ii)        Correct to 6 decimal places

= 3.2520609

MATHEMATICS NOTES FORM FIVE:CALCULATING DEVICES
4/ 5
Oleh