Python Float Quiz for Grade 8

📚 Quick Study Guide

🔢 What are Floats? Floats are numbers with decimal points. They represent real numbers in Python. ➗ Basic Operations: You can perform addition, subtraction, multiplication, and division with floats. 🧮 Float() Function: Converts integers or strings to floating-point numbers. 📍 Precision: Floats have limited precision. Be aware of potential rounding errors. ➕ Mixing Types: When you perform operations with an integer and a float, the result is always a float. 🧪 Scientific Notation: Floats can be expressed in scientific notation (e.g., $1.23e2$ which equals 123.0). ➗ Division: The division operator `/` always returns a float, even if the operands are integers.

Practice Quiz

1. Which of the following is a valid float in Python?
   1. 10
   2. "10.5"
   3. 10.0
   4. Ten
2. What is the result of $5 / 2$ in Python?
   1. 2
   2. 2.5
   3. 2.0
   4. 3
3. How do you convert the integer 7 to a float in Python?
   1. str(7)
   2. float(7)
   3. int(7.0)
   4. to_float(7)
4. What is the data type of the variable `result` after the operation `result = 5.0 + 5`?
   1. int
   2. float
   3. string
   4. boolean
5. Which of the following represents scientific notation for the number 150.0?
   1. 1.5e3
   2. 1.5e2
   3. 15e1
   4. 0.15e4
6. What happens if you try to add a float to a string without proper conversion?
   1. Python converts the string to a float.
   2. Python converts the float to a string.
   3. A TypeError occurs.
   4. The string is ignored, and the float is returned.
7. What is the purpose of using floats in programming?
   1. To represent whole numbers only.
   2. To represent numbers with decimal points or fractional parts.
   3. To store text.
   4. To store boolean values.