I am trying to create 4 buttons in HTML that calls the following functions such as Adding, Subtracting, Multiplying, dividing

I am new to JavaScript and I'm a bit confused about what I'm doing wrong. For this Assignment I need to create 4 buttons in HTML that calls the following functions such as adding, subtracting, multiplying and dividing. I am suppose to prompt the user to enter two numbers and then it will calculate it.

I figured out how to make one adding button but for some reason I am having trouble creating the other buttons for - * /. I am also not sure why it doesn't keep track of the calculations for the subtraction buttons and etc. I am kind of confused how to create multiple functions and buttons all in one program.

function add() {

  var num1, num2, num3;

  numAdd1 = parseInt(prompt("Enter First Number:"));
  numAdd2 = parseInt(prompt("Enter Second Number:"));
  numAdd3 = numAdd1 + numAdd2



  resultAdd = "Result is " + String(numAdd3)
  //document.write(numAdd3 + "<br>")


  document.getElementById("result").innerHTML = resultAdd;

}

function sub() {

  var sub1, sub2, sub3;


  sub1 = parseInt(prompt("Enter First Number:"));
  sub2 = parseInt(prompt("Enter Second Number:"));
  sub3 = sub1 - sub2



  result2 = "result is : " + String(numSub3)
  //document.write(Sub3 + "<br>")


  document.getElementById("result2").innerHTML = result2;

}

<button onclick="add()">Press to Add</button>
<p id="result">Result:</p>

<button onclick="sub()">Press to Subtract</button>
<p id="result2">Result:</p>

<button onclick="Multiply()">Press to Multiply</button>
<p id="result">Result:</p>

<button onclick="Divide()">Press to Divide</button>
<p id="result2">Result:</p>

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