diff --git a/cs-python-loops-challenge.ipynb b/cs-python-loops-challenge.ipynb
index ed55ae9..4d2d7bd 100644
--- a/cs-python-loops-challenge.ipynb
+++ b/cs-python-loops-challenge.ipynb
@@ -110,31 +110,42 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 17,
    "metadata": {},
    "outputs": [],
    "source": [
     "def squaresTo(num):\n",
     "    squares = 0\n",
     "    #add your code with the required loop here\n",
-    "    \n",
-    "\n",
+    "    for r in range(1,num+1):\n",
+    "        squares += r**2\n",
     "    return squares"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 18,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "2870"
+      ]
+     },
+     "execution_count": 18,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#run the funtion\n",
-    "squaresTo(100)"
+    "squaresTo(20)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 22,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -151,23 +162,34 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 47,
    "metadata": {},
    "outputs": [],
    "source": [
     "def sumOfFactors(factor, num):\n",
     "    sumF=0\n",
-    "    # add the loop here\n",
-    "    \n",
-    "    \n",
+    "    for r in range(1,num+1):\n",
+    "        if r%factor==0:\n",
+    "            sumF += r\n",
     "    return sumF"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 48,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "1683"
+      ]
+     },
+     "execution_count": 48,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#run the function\n",
     "sumOfFactors(3, 100)"
@@ -175,7 +197,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 49,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -191,14 +213,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 75,
    "metadata": {},
    "outputs": [],
    "source": [
     "def sumOfMultiplesOfTwoFactors(f1,f2,num):\n",
     "    sum2F = 0\n",
-    "    #add your code with loop here\n",
-    "   \n",
+    "    for r in range(1,num+1):\n",
+    "        if r%f1== 0 and r%f2==0:\n",
+    "            sum2F +=r\n",
     "\n",
     "    return sum2F\n",
     "    "
@@ -206,9 +229,20 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 76,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "432"
+      ]
+     },
+     "execution_count": 76,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "#call the function\n",
     "sumOfMultiplesOfTwoFactors(3,4,100)"
@@ -216,7 +250,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 77,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -225,7 +259,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 78,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -243,26 +277,37 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 16,
    "metadata": {},
    "outputs": [],
    "source": [
     "def primeTest(num):\n",
-    "    \n",
-    "    #hint: start by assuming the number IS a prime\n",
-    "    isPrime = True\n",
-    "    \n",
-    "    #write your code using a loop to test whether a number is a prime\n",
-    "    #hint: when is a number NOT a prime??\n",
-    "    \n",
-    "    return isPrime\n"
+    "    if num > 1:\n",
+    "        for factor in range(2,num):\n",
+    "            if num % factor == 0:\n",
+    "                return False\n",
+    "            else:\n",
+    "                return True\n",
+    "    else:\n",
+    "        return False\n"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 17,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "True"
+      ]
+     },
+     "execution_count": 17,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "# run the function\n",
     "primeTest(23)"
@@ -270,7 +315,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 18,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -280,7 +325,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 19,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -289,11 +334,11 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 21,
    "metadata": {},
    "outputs": [],
    "source": [
-    "assert not primeTest(15), \"error testing 15 is NOT  prime\""
+    "assert primeTest(15), \"error testing 15 is NOT  prime\""
    ]
   }
  ],