diff --git a/cs-python-loops-challenge.ipynb b/cs-python-loops-challenge.ipynb
index ed55ae9..96b698e 100644
--- a/cs-python-loops-challenge.ipynb
+++ b/cs-python-loops-challenge.ipynb
@@ -81,7 +81,34 @@
    "outputs": [],
    "source": [
     "#run the funtion\n",
-    "sumTo(100)"
+    "sumTo(200)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sumTo(5) #1+2+3+4+5 =15"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sumTo(2) # 1+2=3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sumTo(10)"
    ]
   },
   {
@@ -115,10 +142,10 @@
    "outputs": [],
    "source": [
     "def squaresTo(num):\n",
-    "    squares = 0\n",
+    "    squares=0\n",
     "    #add your code with the required loop here\n",
-    "    \n",
-    "\n",
+    "    for i in range(1,num+1):\n",
+    "        squares+=i**2 #You tell the program to square the i\n",
     "    return squares"
    ]
   },
@@ -158,7 +185,8 @@
     "def sumOfFactors(factor, num):\n",
     "    sumF=0\n",
     "    # add the loop here\n",
-    "    \n",
+    "    for i in range(0,num+1,factor):\n",
+    "        sumF+=i\n",
     "    \n",
     "    return sumF"
    ]
@@ -198,8 +226,9 @@
     "def sumOfMultiplesOfTwoFactors(f1,f2,num):\n",
     "    sum2F = 0\n",
     "    #add your code with loop here\n",
-    "   \n",
-    "\n",
+    "    for i in range(1,num):\n",
+    "        if i%f1==0 and i%f2==0:\n",
+    "            sum2F+=i\n",
     "    return sum2F\n",
     "    "
    ]
@@ -214,6 +243,15 @@
     "sumOfMultiplesOfTwoFactors(3,4,100)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sumOfMultiplesOfTwoFactors(3,5,1000)"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -243,7 +281,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -251,6 +289,10 @@
     "    \n",
     "    #hint: start by assuming the number IS a prime\n",
     "    isPrime = True\n",
+    "    i = 2\n",
+    "    while(i < num):\n",
+    "        if num % i == 0:\n",
+    "            isPrime = False\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",
@@ -265,7 +307,7 @@
    "outputs": [],
    "source": [
     "# run the function\n",
-    "primeTest(23)"
+    "primeTest(17)"
    ]
   },
   {
@@ -302,18 +344,6 @@
    "display_name": "Python 3",
    "language": "python",
    "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.5.2"
   }
  },
  "nbformat": 4,