diff --git a/05_sumAll/sumAll.js b/05_sumAll/sumAll.js
index 00880c7..5487635 100644
--- a/05_sumAll/sumAll.js
+++ b/05_sumAll/sumAll.js
@@ -1,5 +1,23 @@
-const sumAll = function() {
-
+const sumAll = function(a,b) {
+    let sum = 0;
+    if (a > b) {
+        min = b;
+        max = a;
+    }
+    else {
+        min = a;
+        max = b;
+    }
+    if (a < 0 || b < 0) {
+        return "ERROR";
+    }
+    if (!Number.isInteger(a) || !Number.isInteger(b)) {
+        return "ERROR";
+    }
+    for (let i = min; i<=max; i++) {
+        sum += i;
+    }
+    return sum;
 };
 
 // Do not edit below this line
diff --git a/05_sumAll/sumAll.spec.js b/05_sumAll/sumAll.spec.js
index be810a6..ddfc2d5 100644
--- a/05_sumAll/sumAll.spec.js
+++ b/05_sumAll/sumAll.spec.js
@@ -4,22 +4,22 @@ describe('sumAll', () => {
   test('sums numbers within the range', () => {
     expect(sumAll(2, 4)).toEqual(9);
   });
-  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-integer parameters', () => {
+  test('returns ERROR with non-integer parameters', () => {
     expect(sumAll(2.5, 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');
   });
 });