< input type="text" id="betTb_chance" class="bt_input top3 betTb_input betTb_payoutL" value="49.50">
a.oninput = function(){
b.value = this.value
}
b.oninput = function(){
a.value = this.value
}
https://jsfiddle.net/ncwd08bu/ <input type="text" id="app">bla<input type="range"></input></input>
$('input[type=text]').val($('input[type=text]').val() + $('input[type=range]').val());