Depending on whether you are upgrading to an aftermarket head unit or simply replacing the old one with another OEM (original equipment manufacturer) unit, you may have to have some additional hardware. This could include things such as a dash kit, wiring harness, or antenna adapter. You do not want the system to have live power while you are making your connections. Turn the vehicle off and remove the cables from your battery. A vehicle repair manual is highly recommended. Also, the vehicle specific kit will contain detailed information on radio removal. Removal of dashboard components may be required, and if you don't know how to remove the parts properly, permanent damage may occur. In some cases, you may find two pairs of holes or slots on the left and right of the face of the radio. These are called "key holes" and will require a special tool that can be purchased at most car audio stores or online to release the head unit. With most harnesses, you will have to squeeze a clip or two for the harness to release from the radio. Make sure that you examine the harness before pulling on it. Be sure the harness you purchased fits the vehicle harness. If it doesn't, take the radio to a car audio shop and have them locate the correct harness adapter. Using a pair of pliers at the base of the wire may help. Make sure you are pulling on the connector and not the wire as this will cause signal loss.
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One-sentence summary -- Purchase all the necessary parts. Unplug your battery terminals. Take your car radio head unit out of the dash. Disconnect the car radio head unit wiring. Disconnect the antenna (usually a thick black wire but can also be a thick single wire).

If your body has recently been subjected to any kind of trauma, this may be the cause of your pain. Particularly if your pain started suddenly following the trauma, you are more likely suffering from an acute injury than from a degenerative condition. Trauma can come in many forms, from having a fall or being involved in a car accident, to working too hard at the gym. Some acute injuries are minor and may heal on their own, but others are more serious. If your back pain does not begin to subside within a few days, see a doctor to ensure that you do not have an injury that requires medical intervention, like a fracture. Strains and sprains are the most common exercise-related injuries. They normally heal within a week with no medical intervention. Sitting too much, particularly at a computer, can cause low back pain. While inactivity sometimes causes back conditions that necessitate medical intervention, the cure is often as simple as the cause. If you believe your back pain may be caused by sitting too much, try increasing your activity level to relieve it. Try getting up for frequent walking breaks throughout the day. It's important to get up from your desk at least once every 60 minutes. You can set reminders on your computer or watch to make sure that you stay on track If possible, get a standing desk so that you can work without sitting all day. If you can't move more during the day, try to improve your comfort by using lumbar support pillows or an ergonomically-designed chair. If increasing your activity doesn't improve your back pain, there may be something more serious going on, so it's a good idea to see your doctor. Sleeping the wrong way or on the wrong mattress can cause back pain. If you have bad sleep habits or need a new mattress, your back pain could be easily resolved. Sleeping on your stomach is the worst position for back pain. Try flipping over on your back to see if you can get some relief. You may also want to put a pillow under your knees to see if that helps. You can also try sleeping on your side with a pillow in between your knees. If this does not relieve your back pain right away, don't give up. You may need to experiment with the pillow height to find the best position for your lower back. Your mattress should be firm to support your back, but not so firm that you shoulders start to bother you. For most people, a medium-firmness mattress is ideal. Supportive shoes are very important for spinal health. If you frequently wear uncomfortable and unsupportive shoes, they may be the cause of your lower back pain. Avoid wearing high heels, as they can cause your spine to be misaligned. If you wear flats, make sure they have some arch support to them. Flat shoes like flip flops can be just as bad for your back, if not worse, than high heels. In some cases, back pain may be caused by carrying heavy items, especially for long periods of time. If you frequently carry heavy bags or other items, try to reduce their weight to see if this improves your condition. Children often experience back pain from carrying backpacks that are too heavy. To avoid this, make sure your child's backpack weighs no more than 20% of his or her body weight. Sometimes, back pain can be caused by too much activity, especially if you are not physically fit or if you exercise sporadically. Think about whether your recent physical activities may be contributing to your back pain. For example, sports such as golf can require repetitive twisting motions, which can cause lower back pain. Running can also produce low back pain. Running on an uneven surface or on a track can also lead to other problems, such as pronated feet, which can disrupt proper muscle movements and cause pain all the way up to the back.
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One-sentence summary -- Think about recent trauma. Assess your activity level. Think about your sleeping habits. Consider your footwear. Think about heavy items you carry. Think about your physical activities.

It's easier for students to understand division if they can imagine a set of items being divided equally amongst a group. While 10/5 might seem confusing, giving out 10 cookies to 5 friends makes it seem simple! If you're teaching your own child, you can introduce division by having them help you divide items into goody bags or separate baked goods into sandwich bags to hand out to friends. In a classroom setting, students can work in groups to divide a number of items, such as candies or plastic bears, evenly among themselves. Most students begin to learn division in the 3rd grade or around the age of 8 or 9. Ask them to divide the same larger number into smaller groups of various sizes. You can use manipulatives, pictures of the items, or a worksheet. This helps them get a better grasp about how basic division works. Manipulatives are any small item that represents the numerical amounts in math problems, such as beans or plastic coins. Your student can physically see and touch the items, which helps them better understand the mathematical concepts. For example, give them 24 beans, then ask them to separate the beans into 2 groups, 3 groups, 4 groups, 6 groups, 8 groups, and finally 12 groups. Explain to them that this is the same as dividing the number 24 by each of these numbers. This seems simple, but it's an easy step to overlook. Before your student can start working through problems on paper, they need to know the symbols they'll use. For example, 10 divided by 5 can be written like this: 10/5 or 105. Show them every way that the problem can be written. They already understand multiplication, so this is a good scaffolding to build on. Show them how the times table can be worked backwards using division. For example, go through the 5 times tables, starting at 5 x 10 = 50. Show your student that 50/10 = 5. Then go to 5 x 9 = 45, and explain that 45/9 = 5. Continue until you complete the times table. Provide your student with simple math problems consisting of numbers that divide evenly. Remind your student that division effectively creates smaller groups out of a larger sum. You can work backwards from multiplication tables. For example, when dividing by 3, the math problems would include 3/3, 6/3, 9/3, 12/3, 15/3, etc. At this point, make sure the numbers divide evenly. You can download free worksheets for your student to use for practice by searching online for "division worksheets." Choose worksheets for beginners. You can also create your own worksheets. For beginners, focus on numerical problems. However, they may benefit from illustrations or context. For example, you might make a worksheet about dividing pizza for a party. The context is that the student must divide certain numbers of pizza slices per varying numbers of guests, but the math problems will contain just numbers, such as 12/3, 12/4, 24/8, etc.
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One-sentence summary --
Present division as a way to share. Show your student how to divide items into smaller, equal groups. Teach your student the symbols used for division problems. Explain that division is the opposite of multiplication. Begin dividing by numbers, starting with 1 and working up to 10.