A simple program to show basic math operations like addition, subtraction, multiplication, and division of two numbers using JavaScript programming language.

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>BASIC MATH OPERATIONS IN JAVASCRIPT</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #EEEDED;
            color: #333;
            font-family: sans-serif;
        }
        main {
            padding: 50px;
            border-radius: 10px;
            background-color: #fff;
            min-width: 500px;
        }
        h1 {
            margin-bottom: 5px;
            font-size: 28px;
            text-align: center;
        }
        h2 {
            margin-bottom: 20px;
            font-size: 20px;
            text-align: center;
        }
        .block {
            margin: 12px auto 0;
            display: flex;
            align-items: center;
            width: 100%;
        }
        label {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 35%;
            line-height: 40px;
            background-color: #434343;
            color: #fff;
            height: 45px;
        }
        input,
        select {
            padding: 10px;
            width: 65%;
            font-size: 14px;
            border-radius: 0 5px 5px 0;
            border: 2px solid #434343;
            outline: none;
            height: 45px;
        }
        .btn {
            display: inline-block;
            padding: 15px;
            background-color: #FF3D57;
            color: #fff;
            outline: none; 
            border: none;
            cursor: pointer;
            width: 150px;
            width: 50%;
            font-size: 16px;
            text-decoration: none;
            text-align: center;
            transition: all .2s;
        }
        .btnReset {
            background-color: #FFCA00;
        }
        .btn:hover {
            opacity: 0.9;
        }
        .output {
            display: block;
            width: 100%;
            margin-top: 12px;
            padding: 20px 0;
            background-color: #434343;
            font-size: 16px;
            text-align:center;
            color: #fff;
        }
        .hide {
            display: none;
        }
    </style>
</head>
<body>
    <main class="container">
        <h1>BASIC MATH OPERATIONS IN JAVASCRIPT</h1>
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <form action="" id="frmCalc">
            <div class="block">
                <label for="grade1">First Number:</label>
                <input type="number" id="number1" required autofocus>
            </div>
            <div class="block">
                <label for="grade2">Second Number:</label>
                <input type="number" id="number2" required>
            </div>
            <div class="block">
                <label for="operator">Select Operator:</label>
                <select id="operator" required>
                    <option value="Add">Add</option>
                    <option value="Subtract">Subtract</option>
                    <option value="Multipy">Multipy</option>
                    <option value="Divide">Divide</option>
                </select>
            </div>
            <div class="block">
                <button type="submit" class="btn">CALCULATE</button>
                <a href="" class="btn btnReset">RESET</a>
            </div>
            <div class="output hide"></div>
        </form>
    </main>

    <script>
        document.querySelector('#frmCalc').onsubmit  = (e) => {
            e.preventDefault()
            let calc = document.querySelector('.output'),
                operator = document.querySelector('#operator').value,
                numbers = document.querySelectorAll(`[id*="number"]`),
                total = 0, message;

            switch (operator) {
                case 'Add':
                    total = parseInt(numbers[0].value) + parseInt(numbers[1].value)
                    message = "The Sum is: "
                    break;
                case 'Subtract':
                    total = parseInt(numbers[0].value) - parseInt(numbers[1].value)
                    message = "The difference is: "
                    break;
                case 'Multipy':
                    total = parseInt(numbers[0].value) * parseInt(numbers[1].value)
                    message = "The product is: "
                    break;
                case 'Divide':
                    total = parseInt(numbers[0].value) / parseInt(numbers[1].value)
                    message = "The qoutient is: "
                    break;
            }

            calc.classList.remove('hide')
            calc.innerHTML = message+total.toFixed(2)
        }
    </script>
</body>
</html>

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