🚀 JavaScript Math Operators
 
JavaScript Math Operators - Interactive Guide

🚀 JavaScript Math Operators

Master Arithmetic in Code!

🎯 The Programming Pattern: GET → CALCULATE → DISPLAY

1️⃣

GET

Collect information from the user using readInt() or readFloat()

2️⃣

CALCULATE

Use operators (+, −, *, /, %) to solve the problem

3️⃣

DISPLAY

Show results using console.log()

+
Addition
Adds two numbers together
5 + 3 = 8
💰 Use for: Total prices, combining amounts
−
Subtraction
Subtracts one number from another
10 - 4 = 6
💵 Use for: Change, discounts, remaining amounts
*
Multiplication
Multiplies two numbers
6 * 7 = 42
🍕 Use for: Repeated amounts, price × quantity
/
Division
Divides one number by another
20 / 4 = 5
🍰 Use for: Splitting evenly, averages
%
Modulus
Finds the remainder after division
17 % 5 = 2
🎯 Use for: Odd/even checks, leftover amounts

💻 Live Code Example

Here's how to write a program that calculates pizza cost:

// STEP 1: GET information let pricePerPizza = 12; let quantity = readInt("How many pizzas? "); // STEP 2: CALCULATE the total let total = pricePerPizza * quantity; // STEP 3: DISPLAY the result console.log("Your total is $" + total);

🧮 Interactive Calculator

Click Calculate to see the result!

📝 Practice Problems

  1. 🎮 Gaming Console: You want to buy a $300 console. You save $15/week. Write code to calculate how many weeks you need.
  2. 🍔 Restaurant Bill: The bill is $68. Split it equally among 4 friends. One has a $10 gift card. How much does each person pay?
  3. 🚗 Road Trip: Your car gets 28 miles per gallon. Gas costs $3.50/gallon. Calculate cost for a 280-mile trip.
  4. 📊 Test Average: You scored 85, 92, and 88 on three tests. Calculate your average.

💡 Pro Tips for Success!

  • ✅ Choose the RIGHT operator: Using + instead of * will give you wrong answers!
  • ✅ Order matters: Use parentheses when you need to add before multiplying
  • ✅ Test your code: Try different numbers to make sure it works correctly
  • ✅ Add comments: Explain what each step does in your code
  • ✅ Variable names: Use descriptive names like totalCost instead of x
Last updated  2026/01/18 08:41:01 PSTHits  96