Problem: Article: In any number, the different digits represent different amounts. For instance, in the number 1,872, the "1" represents thousands, the "8" represents hundreds, the "7" represents tens, and the "2" represents ones. When there is a decimal point in a number, the numbers to the right of the point represent fractions of one.  The places to the right of the decimal point have names that mirror the names of the whole number decimal places. The first number to the right of the decimal point represents tenths, the second represents hundredths, the third represents thousandths, and so on for ten-thousandths, etc.  For example, in the number 2.37589, "2" is the number of ones, "3" is the number of tenths, "7" is the number of hundredths, "5" is the number of thousandths, "8" is the number of ten-thousandths, and "9" is the number of hundred-thousandths. The first step to rounding a decimal is to determine which decimal place you're going to round it to. If you're doing schoolwork, this information is usually given to you — often, the problem will say something like, "round the answer to the nearest tenth/hundredth/thousandth."  For example, if you are asked to round to the nearest thousandth in the number 12.9889, you would start by finding the thousandths place. Counting from the decimal point, the spaces to the right represent tenths, hundredths, thousandths, and ten-thousandths, so the second "8" (12.9889) is the one you want. Sometimes, instructions will tell you exactly which decimal place to round to (e.g., "round to the third decimal place" means the same thing as "round to the nearest thousandth"). Now, find the decimal place to the right of the place you're rounding to. Based on the number in this place, you'll round either up or down. In our example number (12.9889), you're rounding to the thousandths place (12.9889), so now look at the number to the right of this, which is the final "9" (12.9889). To be clear: if the place you're rounding to is followed by a 5, 6, 7, 8, or 9, round it up. In other words, make that decimal place one value greater and get rid of the digits after it. In the example number (12.9889), since the final 9 is higher than 5, round your thousandths place up. The rounded value becomes 12.989. Note that you drop the digits after the rounded decimal place. On the other hand, if the place you're rounding to is followed by a 4, 3, 2, 1, or 0, round it down. This means to leave the rounded digit as it is and get rid of the digits after it.  You wouldn't round 12.9889 down because the final 9 isn't 4 or lower. However, if you were working with the number 12.9884, you could round it down to 12.988. Does this process seem familiar? If so, it's because this is basically how you round whole numbers — the decimal point doesn't change things. One common rounding task is to round a number to the nearest whole number (sometimes, this will be explained as "rounding the number to the ones place"). In this case, use the same rounding technique as before.  In other words, start at the ones place, then look at the number to the right. If this number is 5 or greater, round up. If it is 4 or lower, round down. The decimal point in the middle doesn't change anything. For example, if you needed to round the example number from earlier (12.9889) to the nearest whole number, you'd start by looking at the ones place: 12.9889. Since the "9" to the right is greater than 5, you would round up to 13. Since you've gotten a whole number answer, you don't need the decimal point any more. The directions for rounding above will work well in general. However, when you've been given special directions for rounding decimal places, make sure to follow them before you use the normal rounding rules.  For example, if you receive the instructions "Round 4.59 down to the nearest tenth", you'd round the 5 in the tenths place down even though the 9 to the right means you'd normally round it up. This would give you 4.5. Similarly, if you are told to "round 180.1 up to the nearest whole number," you'd round to 181 even though you'd normally round down.
Summary: Understand the idea of decimal places. Find the decimal place you need to round to. Look at the number in the space to the right. If this number is greater than or equal to five, round up. If this number is less than five, round down. Use the same technique to round to a whole number. Look out for special instructions.

In one sentence, describe what the following article is about: A great way to tone your abs while walking is to do upper body exercises while you walk. Though these exercises may seem to be focusing on your arms, they engage different muscle groups in your core as you walk. Moving your upper body and lower body at the same time engages core muscles as you work to keep your balance.  These exercises are meant to be completed as you walk. You shouldn't stop to do these exercises. In an hour long walk, incorporate three or four sets of these exercises. Do each exercise for a one-minute interval, spaced about seven to eight minutes apart. If you need to start by doing each exercise for 20 or 30 seconds to begin, do that. You can add additional time once one minute feels too easy. You may also try doing groups of three or four exercises together without rest two to four times through your walk. A good way to strengthen your ab muscles while walking, or doing any other daily activity, is to pull your navel toward your spine. This exercise works the transverse abs, which run from your sides to the front of your abs.  As you walk, pull your bellybutton in, like you’re drawing it towards your spine. Hold your abs like that. Make sure you keep breathing as you contract your abs. Don’t suck in your stomach and stop breathing. Start by holding your abs for a few seconds, or until you get to certain objects before you. The stronger your abs get, the longer you’ll be able to hold it. One simple exercise to add to your walking routine is an arm curl. Start by hanging your arms at your side. Bring your hands up towards your shoulder, like you are doing a bicep curl. Make sure to keep your elbows close to your body.  An alternate way to do this exercise is to hold your arms at shoulder height. Curl your elbows up, bringing your hands towards your shoulder. This is also a bicep curl, but with your arms parallel to the ground, making your torso work harder.  If you want an extra challenge, add hand weights to the curls. You can start with three or five pound weights. Doing punches as you walk is a great way to engage multiple groups of core muscles as you walk. They also help raise your heart rate, which gives you a better workout and helps boost your metabolism.  You can try doing front jabs or uppercuts. To do a simple jab, hold your hands in fists at shoulder height. Punch forward with one arm, then the other. You can twist slightly as you punch. Make sure to engage your abs while you do these exercises by contracting your abdominal muscles. You can incorporate these into one minute intervals with other exercises. You can also do sets of 20 jabs and uppercuts for every few minutes you walk. Another good core-toning exercise you can do while you walk is to reach your arms overhead. To do this, lift one arm over your head as you step with your opposite foot. As you take the next step, drop that arm and reach the other hand overhead. Continue to alternate with each step.  To add a bit more core work, you can lean slightly towards the opposite side as you lift your arm. You can also do this exercise with hand weights.
Summary:
Incorporate short bursts of additional exercises to your walking. Walk while pulling in your core. Do arm curls. Punch as you walk. Alternate reaching your arms overhead.