diff --git a/cs-python-loops-challenge.ipynb b/cs-python-loops-challenge.ipynb
index ed55ae9..d66b619 100644
--- a/cs-python-loops-challenge.ipynb
+++ b/cs-python-loops-challenge.ipynb
@@ -42,7 +42,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -76,9 +76,20 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 13,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "5050"
+      ]
+     },
+     "execution_count": 13,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#run the funtion\n",
     "sumTo(100)"
@@ -86,7 +97,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -110,23 +121,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 25,
    "metadata": {},
    "outputs": [],
    "source": [
     "def squaresTo(num):\n",
-    "    squares = 0\n",
+    "    squares=0\n",
     "    #add your code with the required loop here\n",
+    "    for i in range(1,num+1):\n",
+    "        squares+=i**2\n",
     "    \n",
-    "\n",
     "    return squares"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 164,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "338350"
+      ]
+     },
+     "execution_count": 164,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#run the funtion\n",
     "squaresTo(100)"
@@ -134,7 +157,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 111,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -151,23 +174,35 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 154,
    "metadata": {},
    "outputs": [],
    "source": [
     "def sumOfFactors(factor, num):\n",
     "    sumF=0\n",
     "    # add the loop here\n",
-    "    \n",
+    "    for i in range(0,num,factor):\n",
+    "        sumF+=i\n",
     "    \n",
     "    return sumF"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 174,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1683"
+      ]
+     },
+     "execution_count": 174,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#run the function\n",
     "sumOfFactors(3, 100)"
@@ -175,7 +210,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 163,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -191,14 +226,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 165,
    "metadata": {},
    "outputs": [],
    "source": [
     "def sumOfMultiplesOfTwoFactors(f1,f2,num):\n",
     "    sum2F = 0\n",
     "    #add your code with loop here\n",
-    "   \n",
+    "    for i in range(0,num+1,f1*f2):\n",
+    "        sum2F+=i\n",
     "\n",
     "    return sum2F\n",
     "    "
@@ -206,17 +242,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 170,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "120"
+      ]
+     },
+     "execution_count": 170,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#call the function\n",
-    "sumOfMultiplesOfTwoFactors(3,4,100)"
+    "sumOfMultiplesOfTwoFactors(3,4,50)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 171,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -225,7 +272,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 172,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -253,6 +300,10 @@
     "    isPrime = True\n",
     "    \n",
     "    #write your code using a loop to test whether a number is a prime\n",
+    "    for i in range(2, 10):\n",
+    "        if (num % i == 0):\n",
+    "            isPrime = False\n",
+    "\n",
     "    #hint: when is a number NOT a prime??\n",
     "    \n",
     "    return isPrime\n"
@@ -270,7 +321,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 177,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -280,7 +331,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 178,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -289,7 +340,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 179,
    "metadata": {},
    "outputs": [],
    "source": [