diff --git a/05_sumAll/sumAll.js b/05_sumAll/sumAll.js
index 00880c7..7239243 100644
--- a/05_sumAll/sumAll.js
+++ b/05_sumAll/sumAll.js
@@ -1,6 +1,23 @@
-const sumAll = function() {
-
+const sumAll = function(num1, num2) {
+    if (typeof num1 === "number" && typeof num2 === "number") {
+        smallNumber = Math.min(num1, num2);
+        bigNumber = Math.max(num1, num2);
+        sum = smallNumber;
+        for (let i = smallNumber; i <= bigNumber; i++) {
+            if (i > smallNumber) {
+                sum = sum + i;
+            }
+        }
+        if (sum >=0) {
+            return sum;
+        } else {
+            return "ERROR";
+        }
+    } else {
+        return "ERROR";
+    }
 };
 
 // Do not edit below this line
 module.exports = sumAll;
+
diff --git a/05_sumAll/sumAll.spec.js b/05_sumAll/sumAll.spec.js
index 1a9fb7c..a171e5f 100644
--- a/05_sumAll/sumAll.spec.js
+++ b/05_sumAll/sumAll.spec.js
@@ -4,19 +4,19 @@ describe('sumAll', () => {
   test('sums numbers within the range', () => {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  test.skip('works with large numbers', () => {
+  test('works with large numbers', () => {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
-  test.skip('works with larger number first', () => {
+  test('works with larger number first', () => {
     expect(sumAll(123, 1)).toEqual(7626);
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(sumAll(-10, 4)).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, "90")).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, [90, 1])).toEqual('ERROR');
   });
 });