Why does my calculator roundup

There are also some less expensive models e. Before you first use your calculator, you will need to make some adjustments to the default settings. You need to make these changes only one time. On the other hand, there are some things you should do every time you begin a new TVM problem. The following tutorials assume that you already understand the fundamentals math and terminology of the time value of money.

Also, they only deal with time value of money calculations -- not any of the other functions of your calculator. TI 83 and TI 83 Plus. HP 10BII. HP 17B II. The second is smaller, 1. How much carpet do you need to buy to be sure of having enough for both rooms?

The second is just over 1m by 2. Strictly speaking, you would round this to 1m by 2. A quick check with a calculator will, indeed, confirm that you need exactly The last room is 3. How much carpet do I need for all three rooms? However, in rounding down to 2m, you have taken out 0. In rounding up to 4m, you have only added 0. You may not order quite enough carpet although you might get away with it because you rounded up to 12m 2 for the first two rooms.

Multiply 2. This means you need 22m 2 of carpet for all three rooms. A quick check with a calculator will confirm that 20m 2 is not quite enough: You need Estimated time of arrival is used frequently used when travelling. Trains, buses, planes, ships and in-car satellite navigation sat-nav all use ETA.

Your flight may arrive early because of favourable tail winds. Your road trip may take longer than expected because of traffic. The ETA is usually calculated by a computer and can change during your trip. As you near your destination, more data becomes available so the estimated time that you will arrive becomes more accurate.

In this case, the tradesperson concerned has probably estimated how much time they are likely to take to do the work, multiplied it by their hourly or daily rate, and perhaps added additional charges for materials or a call-out.

The ability to estimate will mean that you will know if the answer you get from the calculator is not right, and do it again. Search SkillsYouNeed:. We'll never share your email address and you can unsubscribe at any time. Estimation, Approximation and Rounding See also: Percentages. Round Up or Round Down? Numbers that are less than 5 get rounded down. Numbers that are 5 or higher get rounded up. Rounding to one decimal place: 1.

Rounding: Worked Examples Example 1 Express to the nearest 10 In this example you look at the tens and units. Looking at the units, you know that 6 is more than 5, so you round up.

The answer is Example 2 Express 0. The answer therefore is 0. Example 1 You want to buy carpet for two rooms. The first room is approximately 3m by 3m, which is 9m 2.