Arithmetic operators in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers and store the result in $sum.

PowerShell

$a = 5
$b = 3
$sum = $a [1] $b
Write-Output $sum

Drag options to blanks, or click blank then click option'

A-

B*

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which subtracts instead of adds.

Using '*' which multiplies instead of adds.

The plus sign (+) adds two numbers together in PowerShell.

2fill in blank

medium

Complete the code to multiply two numbers and display the product.

PowerShell

$x = 7
$y = 4
$product = $x [1] $y
Write-Output $product

Drag options to blanks, or click blank then click option'

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' which adds instead of multiplies.

Using '/' which divides instead of multiplies.

The asterisk (*) multiplies two numbers in PowerShell.

3fill in blank

hard

Fix the error in the code to correctly divide two numbers and show the result.

PowerShell

$num1 = 20
$num2 = 5
$result = $num1 [1] $num2
Write-Output $result

Drag options to blanks, or click blank then click option'

A+

B/

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' which multiplies instead of divides.

Using '+' which adds instead of divides.

The forward slash (/) divides one number by another in PowerShell.

4fill in blank

hard

Fill in the blank to calculate the remainder when 17 is divided by 3.

PowerShell

$a = 17
$b = 3
$remainder = $a [1] $b
Write-Output $remainder

Drag options to blanks, or click blank then click option'

A%

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which subtracts instead of finding remainder.

Using '*' which multiplies instead of finding remainder.

The percent sign (%) gives the remainder of division in PowerShell.

5fill in blank

hard

Fill both blanks to calculate the expression: (8 + 2) * 5.

PowerShell

$a = 8
$b = 2
$c = 5
$result = ($a [1] $b) [2] $c
Write-Output $result

Drag options to blanks, or click blank then click option'

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' instead of '+' for addition.

Using '/' instead of '*' for multiplication.

First add 8 and 2 using '+', then multiply the sum by 5 using '*'.

Practice

1. Which arithmetic operator in PowerShell is used to find the remainder of a division?

easy

A. The multiplication operator (*)

B. The division operator (/)

C. The modulus operator (%)

D. The subtraction operator (-)

Solution

1. Step 1: Understand the modulus operator

   The modulus operator (%) returns the remainder after division of two numbers.

2. Step 2: Compare with other operators

   Division (/) returns the quotient, multiplication (*) multiplies, subtraction (-) subtracts.

3. Final Answer:

   The modulus operator (%) -> Option C

4. Quick Check:

   Remainder = % operator [OK]

Hint: Remainder uses % operator in math [OK]

Common Mistakes:

• Confusing division (/) with modulus (%)
• Using * or - for remainder
• Thinking % means percentage, not remainder

2. Which of the following is the correct syntax to multiply two numbers 5 and 3 in PowerShell?

easy

A. Write-Output 5 & 3

B. Write-Output 5 * 3

C. Write-Output 5 multiply 3

D. Write-Output 5 x 3

Solution

1. Step 1: Identify the multiplication operator in PowerShell

   PowerShell uses * for multiplication between numbers.

2. Step 2: Check syntax correctness

   Write-Output 5 * 3 correctly multiplies 5 and 3 and outputs the result.

3. Final Answer:

   Write-Output 5 * 3 -> Option B

4. Quick Check:

   Multiplication uses * operator [OK]

Hint: Use * for multiplication in PowerShell [OK]

Common Mistakes:

• Using 'x' or 'multiply' instead of *
• Using & which is a different operator
• Missing spaces around operator causing errors

3. What will be the output of the following PowerShell code?

$a = 10
$b = 3
$c = $a / $b
Write-Output $c

medium

A. 3

B. 3.0

C. Error

D. 3.33333333333333

Solution

1. Step 1: Understand division operator behavior

   In PowerShell, dividing integers returns a floating-point number with decimals.

2. Step 2: Calculate 10 divided by 3

   10 / 3 equals approximately 3.33333333333333.

3. Final Answer:

   3.33333333333333 -> Option D

4. Quick Check:

   Division returns float result [OK]

Hint: Division returns decimal numbers, not just integers [OK]

Common Mistakes:

• Expecting integer 3 instead of decimal
• Thinking division causes error
• Confusing with integer division truncation

4. Identify the error in this PowerShell script:

$x = 8
$y = 2
$z = $x % $y
Write-Output $z

medium

A. There is no error; script runs correctly

B. Variables must be declared with types before use

C. The modulus operator (%) is not valid in PowerShell

D. Write-Output cannot print variables

Solution

1. Step 1: Check validity of modulus operator

   PowerShell supports % as the modulus operator to get remainder.

2. Step 2: Verify variable usage and output

   Variables can be assigned without explicit types, and Write-Output prints values correctly.

3. Final Answer:

   There is no error; script runs correctly -> Option A

4. Quick Check:

   Modulus and Write-Output are valid [OK]

Hint: Modulus (%) works fine; no type declaration needed [OK]

Common Mistakes:

• Thinking % is invalid operator
• Believing variables need explicit types
• Assuming Write-Output can't print variables

5. You want to calculate the average of three numbers 4, 7, and 9 in PowerShell. Which script correctly does this using arithmetic operators?

hard

A. $avg = (4 + 7 + 9) / 3; Write-Output $avg

B. $avg = 4 + 7 + 9 / 3; Write-Output $avg

C. $avg = 4 + 7 + 9 % 3; Write-Output $avg

D. $avg = (4 * 7 * 9) / 3; Write-Output $avg

Solution

1. Step 1: Understand average calculation formula

   Average = sum of numbers divided by count, so (4 + 7 + 9) / 3.

2. Step 2: Check each option's calculation

   $avg = (4 + 7 + 9) / 3; Write-Output $avg correctly sums all three then divides by 3. $avg = 4 + 7 + 9 / 3; Write-Output $avg divides 9 by 3 first, then adds 4 and 7, wrong order. $avg = 4 + 7 + 9 % 3; Write-Output $avg uses modulus incorrectly. $avg = (4 * 7 * 9) / 3; Write-Output $avg multiplies numbers, not sum.

3. Final Answer:

   $avg = (4 + 7 + 9) / 3; Write-Output $avg -> Option A

4. Quick Check:

   Average = sum / count [OK]

Hint: Use parentheses to sum before dividing for average [OK]

Common Mistakes:

• Missing parentheses causing wrong order
• Using modulus (%) instead of division
• Multiplying numbers instead of summing