Your road trip may take longer than expected because of traffic. Your flight may arrive early because of favourable tail winds. The ETA is based on distance and speed of travel, it is ‘estimated’ because it cannot take into account changes to speed during the journey. Trains, buses, planes, ships and in-car satellite navigation (sat-nav) all use ETA.
#ROUND TO THE NEAREST UNIT CALCULATOR HOW TO#
Need a refresher on how to calculate area? See our page Calculating Area for help.Įstimated time of arrival is used frequently used when travelling. This means you need 22m 2 of carpet for all three rooms.Ī quick check with a calculator will confirm that 20m 2 is not quite enough: You need 20.9m 2 exactly. However, to be absolutely sure, you probably want to round 2.2m up, to 2.5m. 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. In rounding up to 4m, you have only added 0.1m. However, in rounding down to 2m, you have taken out 0.2m. 2.2m rounds down to 2m.Ģ × 4 is 8m 2, which gives a total, for all three rooms of 20m 2. How much carpet do I need for all three rooms?ģ.9m is rounded up to 4m. You’ve decided to add another room to the carpet buying. In each case, you have rounded up one of the numbers by more than you have rounded the other one down, so you’re probably fine.Ī quick check with a calculator will, indeed, confirm that you need exactly 11.54m 2. It’s hard to buy carpet in anything except whole m 2, so you’ll need to round up to 12m 2. Strictly speaking, you would round this to 1m by 2.5m, or 2.5m 2. The first room is approximately 3m by 3m, which is 9m 2. How much carpet do you need to buy to be sure of having enough for both rooms? If you are trying to work out how much carpet you will need, round the length of each wall up to the nearest metre or half-metre if the calculation remains simple, and multiply them together to get the area. When shopping for numerous items it can be useful to keep a running tally, an estimate of the total cost, by rounding items to the nearest currency unit, £, $, € etc. The reason for this is that a shirt that costs 24.99 'sounds' cheaper than one that costs 25.00. Many stores like to give prices ending in. or even to the nearest 10 units (£10, $10, €10), and then add your rounded amounts together. Probably the simplest way to estimate is to round all the numbers that you are working with to the nearest 10 (or 100, if you are working in thousands at the time) and then do the necessary calculation.įor example, if you are estimating how much you will have to pay, first round each amount up or down to the nearest unit of currency, pound, dollar, euro etc. If a guess is totally random, an educated guess might be a bit closer.Įstimation, or approximation, should give you an answer which is broadly correct, say to the nearest 10 or 100, if you are working with bigger numbers. If that number is 5 or over, you round up to the next number, and if it is 4 or under, you round down.Įstimating can be considered as ‘slightly better than an educated guess’. If you are rounding to three decimal places, you look at the fourth decimal place (the fourth number to the right of the decimal point) and so on. In practice, this means that if you’ve been asked to round to the nearest 10, you look at the units. The way it works is straightforward: you look at the number one place to the right of the level that you are rounding to and see whether it is closer to 0 or 10. This is where you make a long number simpler by ‘rounding’, or expressing in terms of the nearest unit, ten, hundred, tenth, or a certain number of decimal places.įor example, 1,654 to the nearest thousand is 2,000. Rounding is often the key skill you need to quickly estimate a number. One very simple form of estimation is rounding. Whatever your precise need, you want to know how to estimate or approximate the right answer. You may also want to know roughly what the right answer to a more complicated calculation is likely to be, to check that your detailed work is correct. You may need to know roughly how much money you need to meet a couple of bills. You may be in a shop and want to know broadly what you’re going to have to pay. Sometimes, you may find it helpful to know the approximate answer to a calculation. Understanding Statistical Distributions.Area, Surface Area and Volume Reference Sheet.Simple Transformations of 2-Dimensional Shapes.Polar, Cylindrical and Spherical Coordinates.Introduction to Cartesian Coordinate Systems.Introduction to Geometry: Points, Lines and Planes.Percentage Change | Increase and Decrease.
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