Arithmetic operators in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers and print the result.

Python

result = 5 [1] 3
print(result)

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

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' will subtract instead of add.

Using '*' or '/' will multiply or divide, not add.

The plus sign + adds two numbers together.

2fill in blank

medium

Complete the code to multiply two numbers and print the result.

Python

result = 7 [1] 4
print(result)

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' adds numbers instead of multiplying.

Using '/' divides numbers, not multiply.

The asterisk * multiplies two numbers.

3fill in blank

hard

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

Python

result = 10 [1] 2
print(result)

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

A+

B*

C/

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' multiplies instead of dividing.

Using '+' or '-' changes the operation to addition or subtraction.

The forward slash / divides the first number by the second.

4fill in blank

hard

Fill both blanks to create a dictionary of squares for numbers greater than 3.

Python

squares = {x: x[1]2 for x in range(1, 6) if x [2] 3}
print(squares)

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

A**

B+

C>

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' instead of '**' will add 2 instead of squaring.

Using '<' instead of '>' will select numbers less than 3.

The operator ** raises a number to a power. The operator > checks if a number is greater than another.

5fill in blank

hard

Fill all three blanks to create a dictionary of uppercase keys and values greater than zero.

Python

result = [1]: [2] for k, v in data.items() if v [3] 0}

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

Ak.upper()

Bv

C>

Dk

Attempts:

3 left

💡 Hint

Common Mistakes

Using k instead of k.upper() keeps keys lowercase.

Using '<' instead of '>' filters wrong values.

k.upper() converts keys to uppercase, v is the value, and > filters values greater than zero.

Practice

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

easy

A. **

B. //

C. %

D. +

Solution

1. Step 1: Understand the meaning of each operator

   The operator % gives the remainder after division, // gives the floor division result, ** is for power, and + is for addition.

2. Step 2: Identify the operator for remainder

   The remainder operator is %, which returns the leftover part after dividing two numbers.

3. Final Answer:

   % -> Option C

4. Quick Check:

   Remainder operator = % [OK]

Hint: Remainder operator looks like a percent sign % [OK]

Common Mistakes:

• Confusing // (floor division) with %
• Using ** instead of %
• Thinking + gives remainder

2. Which of the following is the correct operator syntax to calculate 5 to the power of 3 in Python?

easy

A. 5 ^ 3

B. pow(5, 3)

C. 5 ^^ 3

D. 5 ** 3

Solution

1. Step 1: Recall Python's power operator syntax

   Python uses ** to calculate powers, so 5 ** 3 means 5 to the power of 3.

2. Step 2: Check other options for correctness

   5 ^ 3 is bitwise XOR, 5 ^^ 3 is invalid syntax, and pow(5, 3) is a function call but not an operator syntax.

3. Final Answer:

   5 ** 3 -> Option D

4. Quick Check:

   Power operator = ** [OK]

Hint: Use ** for power, not ^ or ^^ [OK]

Common Mistakes:

• Using ^ instead of ** for power
• Trying ^^ which is invalid
• Confusing function pow() with operator syntax

3. What is the output of the following code?

result = 17 // 4
print(result)

medium

A. 4.25

B. 4

C. 1

D. Error

Solution

1. Step 1: Understand floor division operator //

   The operator // divides and returns the largest whole number less than or equal to the result.

2. Step 2: Calculate 17 // 4

   17 divided by 4 is 4.25, floor division drops the decimal part, so result is 4.

3. Final Answer:

   4 -> Option B

4. Quick Check:

   17 // 4 = 4 [OK]

Hint: Floor division drops decimals, so 17//4 is 4 [OK]

Common Mistakes:

• Confusing // with / which gives float
• Expecting 4.25 instead of 4
• Thinking // rounds up

4. Find the error in this code snippet:

num = 10
result = num % 0
print(result)

medium

A. ZeroDivisionError at runtime

B. No error, output is 0

C. SyntaxError due to % operator

D. TypeError because 0 is int

Solution

1. Step 1: Understand modulo operator with zero

   The modulo operator % cannot divide by zero; it causes an error.

2. Step 2: Identify the error type

   Dividing or modulo by zero raises a ZeroDivisionError at runtime.

3. Final Answer:

   ZeroDivisionError at runtime -> Option A

4. Quick Check:

   Modulo by zero causes ZeroDivisionError [OK]

Hint: Modulo by zero causes runtime error, never allowed [OK]

Common Mistakes:

• Thinking it causes syntax error
• Expecting output 0 instead of error
• Confusing with TypeError

5. You want to calculate the area of a square with side length stored in variable side. Which expression correctly uses arithmetic operators to do this?

hard

A. area = side ** 2

B. area = side // 2

C. area = side + side

D. area = side * 2

Solution

1. Step 1: Recall formula for square area

   The area of a square is side length multiplied by itself, or side squared.

2. Step 2: Match formula with operators

   Using side ** 2 calculates side to the power of 2, which is correct for area.

3. Final Answer:

   area = side ** 2 -> Option A

4. Quick Check:

   Square area = side squared = side ** 2 [OK]

Hint: Square area = side squared, use ** 2 [OK]

Common Mistakes:

• Using side * 2 which doubles side, not area
• Using side + side which adds sides, not area
• Using floor division // which is incorrect