I went all the way, simulated keydowns and all. (Thanks, http://stackoverflow.com/questions/4158847/is-there-a-way-to...)

var element = document.getElementById('answer');var y = document.getElementById('question');var dispatchKeyboardEvent = function(target, initKeyboradEvent_args) {var e = document.createEvent("KeyboardEvents");e.initKeyboardEvent.apply(e, Array.prototype.slice.call(arguments, 1));target.dispatchEvent(e);};var dispatchTextEvent = function(target, initTextEvent_args) {var e = document.createEvent("TextEvent");e.initTextEvent.apply(e, Array.prototype.slice.call(arguments, 1));target.dispatchEvent(e);};var dispatchSimpleEvent = function(target, type, canBubble, cancelable) {var e = document.createEvent("Event");e.initEvent.apply(e, Array.prototype.slice.call(arguments, 1));target.dispatchEvent(e);};var send_key = function (key) {var canceled = !dispatchKeyboardEvent(element,'keydown', true, true, null, key, 0, '');dispatchKeyboardEvent(element, 'keypress', true, true, null, key, 0, '');if (!canceled) {if (dispatchTextEvent(element, 'textInput', true, true, null, key, 0)) {element.value += key;dispatchSimpleEvent(element, 'input', false, false);dispatchSimpleEvent(element, 'change', false, false);}}dispatchKeyboardEvent(element, 'keyup', true, true, null, key, 0, '');}; y.addEventListener('DOMNodeInserted', function(e){var z = eval(y.innerHTML.replace(/[=\s]/g,'').replace(/x/ig, '*').replace(/÷/g, '/')).toString(); for(var i in z){send_key(z[i]); element.value+=z[i];}});