Arithmetic operators

Question 1

What are arithmetic operators used for?

Answer 1

to specify how values are to be manipulated

to perform calculations in algorithms and programs

Question 2

(OCR pseudocode)

+

Answer 2

addition

e.g. 13 + 9 = 24

Question 3

(OCR pseudocode)

-

Answer 3

subtraction

e.g. 24 - 12 = 13

Question 4

(OCR pseudocode)

*

Answer 4

multiplication

e.g. 6 * 9 = 54

Question 5

(OCR pseudocode)

/

Answer 5

division

e.g. 36 / 5 = 5.2

Question 6

(OCR pseudocode)

MOD

Answer 6

modulus division

Returns the remainder after the division of one number by another

e.g. remainder = number MOD 2

number / 2

Question 7

(OCR pseudocode)

DIV

Answer 7

Quotient division
Returns the quotient/lowest integer/whole number

e.g. 11 DIV 4 = 2

Question 8

(OCR pseudocode)

Answer 8

Exponential powers of

e.g. 3 ^ 3 = 27

Question 9

Order of operations

Answer 9

the order of operations needs to be followed in a calculation

Brackets
Indices or powers
Division
Multiplication
Addition
Subtraction

Question 10

A chocolate factory worker puts 20 bars into each box.

Write an algorithm to calculate and output the number of full boxes produced in a day. [2]

Answer 10

numberOfBars = input ("Enter number of bars produced.")
numberOfBoxes = numberOfBars DIV 20

print(numberOfBoxes + “full boxes have been produced.”)

Question 11

Wife an algorithm in pseudocode that would allow a user to:

• input the number of items sold by a shop each day for three days
• calculate the total number of items sold
• calculate the mean number of items sold each day as an integer. [3]

Answer 11

day1 = input ("Please enter number sold on day 1")
day2 = input ("Please enter number sold on day 2")
day3 = input ("Please enter number sold on day 3")
total = day1 + day2 + day3
meanSold = total DIV 3