title: How to ADD numbers in vueJS
body: <p>If I change the symbols at  {{ num1+num2+num3 }} with symbols for multiplication (*) or substraction (-) it works well.  However, when trying to add by using the (+) it simply concatenates. </p>
  
  <pre><code>    &lt;div id="vue_mult"&gt;
      &lt;input type="number" v-model="num1"  min="78" max="98" /&gt; + 
      &lt;input type="number" v-model="num2"  min="78" max="98" /&gt; + 
      &lt;input type="number" v-model="num3"  min="78" max="98" /&gt; =
      {{ num1+num2+num3 }}
  &lt;/div&gt;
      &lt;script&gt;
      const app = new Vue({
          el:'#vue_mult',
          data: {  
              num1:0,
              num2:0,
              num3:0
          } //end data property 
      }) //end Vue object
  &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>