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Mathematics for IGCSE & O level - Using A Calculator (Section 2)

1
When calculating with time, what key is used to convert it to hours, minutes, and seconds?
Answer
(B)
The degree, minute, second key ( ° ' '' ).
2
What is an example of standard form?
Answer
(D)
$$ 2.3 \times 10^5 $$
3
What are the 3 options to help check the answer?
Answer
A
B
C
D
4
What operation comes before addition and subtraction?
Answer
(C)
Multiplication and division
5
If a calculator displays 2.33333... as an answer, what would be the correct representation of the answer?
Answer
(D)
2 1/3
6
What are the steps to take, when estimating the answer?
Answer
A
B
C
7
If your answer isn't close to the estimated answer, what should you do?
Answer
B
D
8
How should you enter 2 hours and 15 minutes when working with a calculator that uses a decimal format?
Answer
(C)
2.25
9
When entering fractions, why are brackets used?
Answer
(C)
To do each calculation first.
10
How is the area of a sphere worked out?
Answer
(A)
$$A = 4pi r^2$$
11
What is the correct order of operations?
Answer
(B)
Parentheses, Exponents, Multiplication, Division, Addition, Subtraction
12
What do we know when multiplying by a number greater than 1?
Answer
(C)
The result will be greater than the starting number.
13
When is it important to write the units?
Answer
A
B
D
14
What is the first thing you should do when doing time calculations on a calculator?
Answer
(B)
Make sure all the units are the same.
15
What does the \( \boxed{EXP} \) key on a calculator represent?
Answer
(A)
Exponents
16
Which of the following are key to remember when entering fractions in the calculator?
Answer
B
C
D
17
What is the formula used to find area?
Answer
(A)
$$ A = 4pi r^2 $$
18
To check the result, the user needs to use which of the following?
Answer
A
B
19
What does a scientific calculator have?
Answer
(B)
Square root, square and cube root
20
If your calculator gives an answer, but you have to make sure it is in the correct format, what will it be in?
Answer
(A)
Decimal form
21
What does a scientific calculator allow you to do?
Answer
(D)
All of the above.
22
In the order of operations, which calculation is done first?
Answer
(C)
Parentheses
23
Which of the following keys will you need for the fraction form?
Answer
(B)
$$ \frac{a}{b} $$
24
If a time is 3 hours and 45 minutes, how do you input this into your calculator if using decimal form?
Answer
(C)
3.75
25
What does the order of operations specify?
Answer
(A)
The order in which calculations are performed.
26
In the expression 2 + 3 x 4, which operation is performed first according to the order of operations?
Answer
(B)
Multiplication
27
When a calculator displays 2.66666... what is the best way to present it?
Answer
(D)
2 2/3
28
Which operation is carried out after parentheses in the order of operations?
Answer
(C)
Exponents
29
Which of the following is the correct way to enter the fraction $$2/3$$ into the calculator to be calculated?
Answer
(A)
2 / 3
30
Which is the correct method when using the calculator to calculate?
Answer
A
B
C
31
What are the steps to calculate fractions on a calculator?
Answer
(D)
All the above.
32
When using the degree symbol key ( ° ' '' ) on your calculator, what are you calculating?
Answer
(B)
Time.
33
Which of the following is the correct way to enter a mixed number, such as 2 1/3, in a calculator?
Answer
(D)
First the whole number, then the fraction
34
When might you need to use a degree, minute, second ( ° ' '' ) key?
Answer
(C)
Calculating time.
35
What does the \( \boxed{EE} \) key stand for?
Answer
(A)
Exponent
36
What should you do if the problem statement is not clear on the level of accuracy needed?
Answer
(A)
Round the answer to three significant figures.
37
What should be used to estimate the answer?
Answer
B
C
D
38
When using the calculator, what should the user do to check the result?
Answer
(D)
In all of the above.
39
If a calculator shows the answer in a format like 3.5 x 10^6, what is the format called?
Answer
(C)
Standard Form
40
If you enter a fraction, and the answer is displayed like this \( \frac{2}{3} \), how can the answer be presented?
Answer
(C)
Fraction form.
41
If your calculator displays the answer to a calculation as 2.33333..., what should you do to express this number more accurately?
Answer
(C)
Try to convert it to a fraction like 2 1/3 or 7/3.
42
In the formula for the surface area of a sphere, A = 4πr², what does π represent?
Answer
(C)
A mathematical constant (approximately 3.14159)
43
When does the use of units need to be applied?
Answer
A
B
C
44
What is the inverse of addition?
Answer
(B)
Subtraction
45
What is the relationship between multiplication and division?
Answer
(C)
They are inverse operations.
46
In the equation for the surface area of a sphere, $$A = 4pi r^2$$, what does $$pi$$ represent?
Answer
(C)
A mathematical constant
47
What is the inverse operation of multiplication?
Answer
(C)
Division
48
When dividing 45 by a number greater than one, what can be expected?
Answer
(C)
The result will be less than 45.
49
What should you do if your answer is not close to the estimated answer?
Answer
(B)
Check for any errors.
50
What do the units need to be when working with time?
Answer
(B)
The same