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Mathematics for IGCSE & O level - Using A Calculator (Section 3)

1
If 45 \( \div \) 3 is entered into the calculator, what would be the result?
Answer
(A)
15
2
If you are using a calculator and are unsure about the required accuracy, what might the statement tell you?
Answer
(C)
To round the answer to a specific number of significant figures.
3
If you are estimating the result, what is this method used for?
Answer
(B)
To ensure you have the correct answer.
4
What is the name of the formula for the surface area of a sphere?
Answer
(A)
$$ A = 4pi r^2 $$
5
What does PEMDAS stand for?
Answer
(A)
Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
6
When there is no degree of accuracy, what is used?
Answer
(C)
Three significant figures
7
If a calculation results in the number 2.333333..., how can the number be correctly represented?
Answer
(C)
7/3
8
If a calculator display shows 3.5 x 10^6, which of the following is the correct standard form?
Answer
(B)
3,500,000
9
If a calculator displays an answer in the form of 2.3 x 10^5, what is this called?
Answer
(C)
Standard Form
10
Which key is typically used to change a time display into hours, minutes, and seconds on a calculator?
Answer
(A)
The key with the symbol: ° ' ''
11
The statement should tell you what, if you do not know the degree of accuracy?
Answer
(A)
To give the answer to three significant figures.
12
Which of the following best describes the correct order of operations?
Answer
(A)
PEMDAS
13
What should you do if your answer is not close to the estimated answer?
Answer
(C)
Check your work for errors.
14
If no degree of accuracy is given, what is the correct way to write the answer?
Answer
(C)
Use three significant figures
15
What is the key to enter a number like 3.5 x 10^6 into your calculator?
Answer
(B)
\( \boxed{EE} \) key
16
When there is no degree of accuracy, how do you present your answer?
Answer
(C)
To three significant figures.
17
What does $$1.25 \text{ minutes}$$ equal in minutes and seconds?
Answer
(B)
1 minute 15 seconds
18
If 45 is divided by a number greater than 1, what will the result be?
Answer
(C)
Less than 45
19
What should you do to enter the time of 2 hours 30 minutes into the calculator?
Answer
(A)
2.5
20
To check your result, what should the answer be close to?
Answer
(A)
The estimated answer.
21
If you are unsure what degree of accuracy is appropriate, the statement may tell you
Answer
(A)
To give your answer to three significant figures.
22
When do you round your answer to significant figures?
Answer
(D)
When the statement does not tell you the needed accuracy.
23
What mnemonic can be used for remembering the order of operations?
Answer
(A)
PEMDAS
24
How many seconds are in a minute?
Answer
(C)
60
25
What is the opposite of division?
Answer
(A)
Multiplication
26
When do you write your answer with three significant figures?
Answer
(B)
When you have no degree of accuracy.
27
What do you need to make sure when doing time calculations?
Answer
(A)
That the units are the same
28
If the calculator shows the number, $$ 4.5 imes 10^6 $$, in what format is this written in?
Answer
(C)
Standard form
29
In a standard form, how do you present the answers?
Answer
(A)
$$ 3.5 imes 10^6 $$
30
According to the order of operations, what calculation is performed before addition and subtraction?
Answer
(C)
Multiplication and Division
31
If you divide 45 by a number less than 1, what would be the result?
Answer
(C)
The result will be greater than 45.
32
What is the key to use, if your calculator uses the \( \boxed{EXP} \) key?
Answer
(B)
\( \boxed{EE} \) key
33
When using the degree symbol key ( ° ' '' ), what calculations are used?
Answer
(C)
Time.
34
If you multiply 45 by a number less than 1, what would you expect?
Answer
(C)
The result to be less than 45.
35
What is the correct order of operations?
Answer
(B)
PEMDAS
36
When 45 is divided by a number between zero and one, is the result larger or smaller than 45?
Answer
(C)
Larger than 45
37
What happens to 45 when it is divided by a number greater than 1?
Answer
(C)
The result is less than 45.
38
If the answer is not close to the estimated answer, what should be done?
Answer
B
C
D
39
What should you check, when you have finished the calculation?
Answer
(D)
All of the above.
40
When writing a fraction in a calculator, how are brackets used?
Answer
(B)
Before the numerator and the denominator, so that the calculator does this calculation first.
41
When the calculator shows 2.5 what is the proper way to enter it?
Answer
(A)
2 hours 30 minutes
42
When you see the \( \boxed{EXP} \) key on your calculator, what is this representing?
Answer
(B)
Exponents
43
When using the calculator, what should the user estimate?
Answer
(B)
The result of the calculation.
44
If a number is multiplied by a number greater than 1, is the result greater than, equal to, or less than the original number?
Answer
(A)
Greater than
45
In order to find the solution of a calculation, what should you do?
Answer
A
B
C
D
46
When dividing by a number between 0 and 1, what can you expect?
Answer
(C)
The result to be greater than the starting number.
47
If a number is multiplied by a fraction between 0 and 1, will the result be greater than, equal to, or less than the original number?
Answer
(C)
Less than
48
In a scientific calculator, what are the functions?
Answer
(A)
Square root, square and cube root
49
Which operation comes after exponents in the order of operations?
Answer
(B)
Multiplication and Division
50
When you enter a time of 5 hours 45 minutes into your calculator, how would this be represented in decimal form?
Answer
(B)
5.75