diff --git a/calculator/index.html b/calculator/index.html
index 19c3434..9151946 100644
--- a/calculator/index.html
+++ b/calculator/index.html
@@ -16,7 +16,7 @@
         </div>
         <div class="buttons">
             <button id="clear" class="btn" value="cls" data-ops="">A/C</button>
-            <button id="action" class="btn" value="+/-" data-negate="">+/-</button>
+            <button id="action" class="btn" value="+/-" data-ops="">+/-</button>
             <button id="action" class="btn" value="%" data-ops="">%</button>
             <button id="action" class="btn" value="/" data-ops="">÷</button>
             <button class="btn" value="7" data-num="">7</button>
diff --git a/calculator/js/script.js b/calculator/js/script.js
index 32f26ff..6edbce6 100644
--- a/calculator/js/script.js
+++ b/calculator/js/script.js
@@ -92,6 +92,12 @@ function handleOperatorClick(operatorClicked) {
         return;
     } else if (operatorClicked === '=') {
         handleOperation();
+    } else if (operatorClicked === '+/-') {
+        negateNumber();
+        return
+    } else if (operatorClicked === '%') {
+        percentageNumber();
+        return
     } else {
         if(ops.secondNum && ops.numFlag){
             handleOperation();
@@ -121,6 +127,31 @@ function calculator(event){
     }
 }
 
+function negateNumber(){
+    // returns a negated number
+    let negated;
+    if (!ops.numFlag || !ops.onSecondNumber) {
+        negated =  Number(ops.firstNum) * -1;
+        ops.firstNum = String(negated);
+    } else {
+        negated = Number(ops.secondNum) * -1;
+        ops.secondNum = String(negated);
+    }
+    updateDisplay(negated);
+}
+
+function percentageNumber() {
+    let percent;
+    if (!ops.numFlag || !ops.onSecondNumber) {
+        percent = Number(ops.firstNum) / 100;
+        ops.firstNum = String(percent);
+    } else {
+        percent = Number(ops.secondNum) / 100;
+        ops.secondNum = String(percent);
+    }
+    updateDisplay(percent);
+}
+
 buttons.forEach(btn => {
     btn.addEventListener('click', calculator);
 });
\ No newline at end of file