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HTML

<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id="app">
   <input type="number" class="form-control" v-model="number">
</div>

Babel + JSX

new Vue({
	el: '#app',
  data () {
  	return {
		 number: 50
		}
  },
  watch: {
    // whenever question changes, this function will run
    number: function (newQuestion) {
      if(this.number > 100) {
     	  this.number = 100
      }
			if (this.number < 0) {
      	this.number = 0
      }
    }
  }
});