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Maths Year 9 Using a Calculator
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Practise Combined Operations Using a Calculator

In this worksheet, students use a calculator to carry out more complex calculations.

'Practise Combined Operations Using a Calculator' worksheet

Key stage:  KS 3

Curriculum topic:  Number

Curriculum subtopic:  Use Calculators/Technology for Accuracy

Difficulty level:  

down

Worksheet Overview

QUESTION 1 of 10

This worksheet is about carrying out complex calculations on a calculator.

 

Example

Use your calculator to work out the following to 1 decimal place:

 

40 × (84.2 - 31)
-√  102 + 872
 

 

Answer

Type the following carefully into your calculator:

40 x ( 84.2 - 31 ) ÷ - √ ( 10 ^ 2 + 87 ^ 2 ) =

 

This gives the answer -24.29977513.

We round this off to 1 decimal place to give the answer -24.3

Use your calculator to work out the following to 1 decimal place:

 

√ (592 + 95.12)    
 

Use your calculator to work out the following to 1 decimal place:

 

√ (362 + 27.92)    
 

Use your calculator to work out the following to 1 decimal place:

 

√ (612 + 34.62)    
 

Use your calculator to work out the following to 1 decimal place:

 

√ (252 + 28.72)    
 

Use your calculator to work out the following:

 

√ (72 + 242)    
 

 

(Answer is a whole number)

Use your calculator to work out the following to 1 decimal place:

 

31 × (46.1 - 82)
-√  1.72 + 492
 

Use your calculator to work out the following to 1 decimal place:

 

23 × (30.7 - 79)
-√  73.42 + 342
 

Use your calculator to work out the following to 1 decimal place:

 

25 × (99 - 36)
   (17.7 + 10)3
 

Use your calculator to work out the following to 1 decimal place:

 

42 × (34.7 - 95)
   80.82 + 382
 

Use your calculator to work out the following to 1 decimal place:

 

60 × (67.3 - 84)
√  (23 + 703)
 
  • ANSWERS
  • Question 1

Use your calculator to work out the following to 1 decimal place:

 

√ (592 + 95.12)    
 
CORRECT ANSWER
111.9
EDDIE SAYS
On the calculator, press:
√ ( 59 ∧ 2 + 95.1 ∧ 2 ) =
  • ANSWERS
  • Question 2

Use your calculator to work out the following to 1 decimal place:

 

√ (362 + 27.92)    
 
CORRECT ANSWER
45.5
EDDIE SAYS
On the calculator, press:
√ ( 36 ∧ 2 + 27.9 ∧ 2 ) =
  • ANSWERS
  • Question 3

Use your calculator to work out the following to 1 decimal place:

 

√ (612 + 34.62)    
 
CORRECT ANSWER
70.1
EDDIE SAYS
On the calculator, press:
√ ( 61 ∧ 2 + 34.6 ∧ 2 ) =
  • ANSWERS
  • Question 4

Use your calculator to work out the following to 1 decimal place:

 

√ (252 + 28.72)    
 
CORRECT ANSWER
38.1
EDDIE SAYS
On the calculator, press:
√ ( 25 ∧ 2 + 28.7 ∧ 2 ) =
  • ANSWERS
  • Question 5

Use your calculator to work out the following:

 

√ (72 + 242)    
 

 

(Answer is a whole number)

CORRECT ANSWER
25
EDDIE SAYS
On the calculator, press:
√ ( 7 ∧ 2 + 24 ∧ 2 ) =
This forms the 7, 24, 25 Pythagorean Triad.
  • ANSWERS
  • Question 6

Use your calculator to work out the following to 1 decimal place:

 

31 × (46.1 - 82)
-√  1.72 + 492
 
CORRECT ANSWER
22.7
EDDIE SAYS
On the calculator, press:
31 × ( 46.1 - 82 ) ÷ - √ ( 1.7 ∧ 2 + 49 ∧ 2 ) =
  • ANSWERS
  • Question 7

Use your calculator to work out the following to 1 decimal place:

 

23 × (30.7 - 79)
-√  73.42 + 342
 
CORRECT ANSWER
13.7
EDDIE SAYS
On the calculator, press:
23 × ( 30.7 - 79 ) ÷ - √ ( 73.4 ∧ 2 + 34 ∧ 2 ) =
  • ANSWERS
  • Question 8

Use your calculator to work out the following to 1 decimal place:

 

25 × (99 - 36)
   (17.7 + 10)3
 
CORRECT ANSWER
0.1
EDDIE SAYS
On the calculator, press:
25 × ( 99 - 36 ) ÷ ( 17.7 + 10 ) ∧ 3 =
  • ANSWERS
  • Question 9

Use your calculator to work out the following to 1 decimal place:

 

42 × (34.7 - 95)
   80.82 + 382
 
CORRECT ANSWER
-0.3
EDDIE SAYS
On the calculator, press:
42 × ( 34.7 - 95 ) ÷ ( 80.8 ∧ 2 + 38 ∧ 2 ) =
  • ANSWERS
  • Question 10

Use your calculator to work out the following to 1 decimal place:

 

60 × (67.3 - 84)
√  (23 + 703)
 
CORRECT ANSWER
-1.7
EDDIE SAYS
On the calculator, press:
60 × ( 67.3 - 84 ) ÷ √ ( 23 + 70 ∧ 3 ) =
---- OR ----

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