Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. There are 12 inches in a foot and 36 inches in a yard. Rather than use a “Gauge” figure, the metric system uses the (major) diameter in millimetres. The length is also measured in millimetres and exactly the same as it is for the imperial system. It is always best to get the right type of screw for the job, so we have written a project specifically about this. Have a look here for our project on the different kinds of screw you can buy. The gauge (imperial) is half the imperial diameter (in 16th of an inch) of the screw head, roughly. The precise relationship of imperial screw head sizes and the gauge can be calculated. The formula is as follows:

It is worth noting that there is no direct link here between the head size of an imperial screw and the gauge of that screw. It is purely coincidence that, from screw gauges 6- upwards, that the gauge is close to twice the head diameter although some sources would have you believe this is how the gauge is calculated. There are 420 pupils in the school. Two hundred fifty-two pupils go to the 1st level. Write as a fraction what part of the pupils goes to the 1st grade and what part to the 2nd grade. Shorten both fractions to their basic form. An alternative method for finding a common denominator is to determine the least common multiple (LCM) for the denominators, then add or subtract the numerators as one would an integer. Using the least common multiple can be more efficient and is more likely to result in a fraction in simplified form. In the example above, the denominators were 4, 6, and 2. The least common multiple is the first shared multiple of these three numbers. Multiples of 2: 2, 4, 6, 8 10, 12 These are the most commonly used screws nowadays, but there are great deal more so if you are not sure about which types of screws to use, see also our projects on different types of screw, We also have a great project on how to countersink. There have been a number of different standards for the inch in the past, with the current definition being based on the international yard. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.Someone ate 1/10 of a cake, leaving only 9/10. If you eat 2/3 of the cake left, how much of a whole cake will you have eaten? fraction and use a forward slash to input fractions i.e., 12/3 . An example of a negative mixed fraction: -5 1/2. There are a range of acronyms and letters that you often find on screw boxes or in their online descriptions. Here is a summary of the most common, and what they mean:

Similarly, fractions with denominators that are powers of 10 (or can be converted to powers of 10) can be translated to decimal form using the same principles. Take the fraction 1 Generally available in 5.000 & 6.000 Metre lengths, in Grade 6063 & 6082. 20 x 10 x 1.5mm Aluminium box sectionDefinition: A centimeter (symbol: cm) is a unit of length in the International System of Units (SI), the current form of the metric system. It is defined as 1/100 meters. the decimal would then be 0.05, and so on. Beyond this, converting fractions into decimals requires the operation of long division. Proper fraction button and Improper fraction button work as pair. When you choose the one the other is switched off. Rules for expressions with fractions: Fractions - use a forward slash to divide the numerator by the denominator, i.e., for five-hundredths, enter 5/100. If you use mixed numbers, leave a space between the whole and fraction parts.

ST – Self Tapping; These screws have a tip that will allow them to be screwed into (typically wood) without a pilot hole being drilled. This saves a lot of time! This process can be used for any number of fractions. Just multiply the numerators and denominators of each fraction in the problem by the product of the denominators of all the other fractions (not including its own respective denominator) in the problem. EX:

Generally available in 7.500 to 7.650 Metre lengths in Grade 43; however other lengths and grades are available. For your information Kg/m refers to the Kilograms per Metre of the section, as an example a 4.200 Metre length of 48.3 OD x 3.2mm (CHS) Circular Steel Hollow Section (3.56 Kg/m) would weigh (4.2 x 3.56) 14.952 Kg's Total. 21.3 OD x 3.2mm (CHS) Circular Steel Hollow Section (1.43 Kg/m) Generally available in 5.000 & 6.000 Metre lengths, in Grade 6063 & 6082. 1/2″ x 1/2″ x 1mm Aluminium box section Converting from decimals to fractions is straightforward. It does, however, require the understanding that each decimal place to the right of the decimal point represents a power of 10; the first decimal place being 10 1, the second 10 2, the third 10 3, and so on. Simply determine what power of 10 the decimal extends to, use that power of 10 as the denominator, enter each number to the right of the decimal point as the numerator, and simplify. For example, looking at the number 0.1234, the number 4 is in the fourth decimal place, which constitutes 10 4, or 10,000. This would make the fraction 1234