calculate feasible division questions

app/controllers/application.js

@@ -31,6 +31,24 @@ export default Ember.Controller.extend({
     }
   }),
 
+  wholeNumberDivisionTuples: Ember.computed(function() {
+    const tuples = [];
+    const max = 100;
+    var numerator = 1;
+    while (numerator <= max) {
+      var denominator = 1;
+      while (denominator <= max) {
+        let answer = numerator / denominator;
+        if (answer % denominator === 0) {
+          tuples.pushObject([numerator, denominator]);
+        }
+        denominator += 1;
+      }
+      numerator += 1;
+    }
+    return tuples;
+  }),
+
   actions: {
     turnOn() {
       this.set('isOn', true);
@@ -81,9 +99,26 @@ export default Ember.Controller.extend({
       this.set('isDisplayingAnswer', false);
       var problemCount = 0;
       const problems = [];
-      while (problems.length < 3) {
-        let termOne = Math.floor(Math.random() * 10);
-        let termTwo = Math.floor(Math.random() * 10);
+      const uniqueRandomIndexes = [];
+      const t = this.get('wholeNumberDivisionTuples');
+      while (uniqueRandomIndexes.length < 4) {
+        const index = Math.floor(Math.random() * t.length);
+        if (!uniqueRandomIndexes.contains(index)) {
+          uniqueRandomIndexes.pushObject(index);
+        }
+      }
+      while (problems.length < 4) {
+        let termOne;
+        let termTwo;
+        switch (this.get('operator')) {
+          case '/':
+            termOne = t[uniqueRandomIndexes[problems.length]][0];
+            termTwo = t[uniqueRandomIndexes[problems.length]][1];
+            break;
+          default:
+            termOne = Math.floor(Math.random() * 10);
+            termTwo = Math.floor(Math.random() * 10);
+        }
         let problem = this.store.createRecord('problem', {
           termOne: termOne,
           termTwo: termTwo,