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Mathematics for IGCSE & O level - Using A Calculator (Section 1)

1
What should you do if the answer is not clear to the estimated answer?
Answer
(B)
This suggests that you have not used the correct order of operations.
2
When writing a fraction in a calculation, how do you ensure that the calculator follows the correct order of operations?
Answer
(B)
Use brackets to group the numerator and denominator.
3
When calculating with time, what is the first step to make sure that you can calculate correctly?
Answer
(B)
Correctly typing the time into your calculator
4
How do you write the number 3.5 x 10^-4 in standard form on your calculator?
Answer
(B)
Press 3.5, then press the EE key, then press -4.
5
What should you do if the problem is not set in context or you are not sure of the accuracy?
Answer
(C)
Give the answers to two significant figures.
6
If a question asks for an answer in 2 significant figures, how many digits should the answer have?
Answer
(A)
Two digits, counting from the left, including any zeros.
7
Which of the following can be used to check the result of a calculation?
Answer
A
C
8
What should you remember when rounding numbers in the calculation?
Answer
(C)
Round intermediate values to one more significant figure than the final answer.
9
When might you write numbers in standard form?
Answer
(B)
When it involves large or small numbers.
10
If you are calculating the surface area of a sphere and you are given the radius, what formula should you use?
Answer
(A)
A = 4πr²
11
If your calculator shows a decimal when you have a time calculation, how do you change it to hours and minutes?
Answer
(B)
Press the shift key then the "°' key.
12
Which of these keys is commonly used to enter a fraction into the calculator?
Answer
(C)
abc
13
When might you choose to estimate the answer?
Answer
(B)
When the problem is in context.
14
What is standard form used for?
Answer
(C)
To show large or small numbers concisely.
15
When might you need to use brackets on your calculator?
Answer
(B)
When entering a fraction.
16
What is the correct order of operations to perform calculations?
Answer
(C)
Any power/indices, then Multiplication and Division, then Addition and Subtraction
17
In the context of a calculator, what does 'significant figures' refer to?
Answer
(D)
Digits in a number that contribute to its precision.
18
When converting 1.25 minutes into seconds, what is the correct calculation?
Answer
(B)
1. 25 * 60 = 75 seconds
19
Which of the following operations are inverse operations?
Answer
B
C
20
What happens when you do calculations with fractions on your calculator?
Answer
(D)
The display changes to a mixed number automatically, if you enter an improper fraction.
21
If a calculator gives an answer of 5.2 x 10^3, how do you convert this to an ordinary number?
Answer
(B)
Move the decimal point 3 places to the right, resulting in 5200
22
What do you need to do after you have written the answer into a calculator?
Answer
(A)
You must round your answer to the correct significant figures
23
What could you use to estimate the answer when it is not exact?
Answer
(D)
Use the same method of estimating an answer as a check
24
Which of the following are good methods to check accuracy?
Answer
A
C
B
25
What is the purpose of the EE (or EXP) key on a calculator?
Answer
(B)
To enter standard form numbers.
26
Which key is used to convert between hours and minutes on the calculator?
Answer
(A)
The "°' key
27
If the question involves fractions, what should the user use, to make sure that they are entered correctly?
Answer
(B)
Always the fraction key.
28
What is the opposite operation of subtraction?
Answer
(A)
Addition
29
What method is used when there is no information about the needed accuracy?
Answer
(C)
Round the answer to three significant figures.
30
If the statement does not tell you the units of accuracy, what should you do?
Answer
(A)
Round to three significant figures.
31
When the statement does not include which information, you give the answer to three significant figures?
Answer
(C)
The degree of accuracy.
32
What should you do when calculating time and you want to enter 2 hours 30 minutes?
Answer
(B)
2.5
33
In the equation for the surface area of a sphere, $$A = 4pi r^2$$, what does the $$r^2$$ represent?
Answer
(A)
The radius squared
34
In the formula for surface area, $$ A = 4pi r^2 $$, what does the 4 represent?
Answer
(B)
A constant
35
What does the order of operations mean?
Answer
(C)
It dictates the sequence in which mathematical operations are performed
36
What key is needed to convert the answer to hours, minutes and seconds?
Answer
(B)
Degree key
37
What is the answer to the division of 45 \( \div \) 5?
Answer
(B)
9
38
When is the time display usually in the decimal form?
Answer
(C)
In the answer.
39
When writing a mixed number on a calculator using the fraction key, what is the first step?
Answer
(C)
Enter the whole number.
40
How do you know the answer you have calculated is correct?
Answer
(D)
All of the above.
41
If a problem is given to you in a real-life situation and is not exact, think about
Answer
(A)
What degree of accuracy is sensible.
42
Which of the following operations should be performed first, according to the correct order of operations?
Answer
(C)
Exponents
43
Which key is used to change a time display from decimal to hours, minutes, and seconds?
Answer
(B)
The degree symbol key ( ° ' '' )
44
What is the result of 2 + 3 x 4?
Answer
(B)
14
45
When is a time calculator usually in the decimal form?
Answer
(C)
When it gives an answer.
46
Which of the following can be used to check your answer?
Answer
A
B
C
D
47
When you calculate the area, what needs to be used?
Answer
(A)
$$ 4pi r^2 $$
48
When estimating the answer to a question, what are the benefits of doing so?
Answer
A
D
49
What are the important steps for solving a question?
Answer
(D)
All of the above.
50
What is the correct way to enter the calculation $$2 + 3 \times 4$$ into a calculator to get the correct answer?
Answer
(C)
3 x 4 + 2