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Learn how to read a ruler and what the fraction markings mean. Plus, learn how to use a metric ruler and the decimal to metric conversions.
Learn the 1/8 of an inch marks. The 1/8 of an inch marks are the smaller marks found directly in between the 1/4 of an inch marks on the ruler. Between 0 and 1 inch, there are marks that denote 1/8, 1/4 (or 2/8), 3/8, 1/2 (or 4/8), 5/8, 6/8 (or 3/4), 7/8, and 1 (or 8/8) of an inch.
Where is 1/8″ on a ruler While counting in eighths can be tricky, a standard ruler makes it easy since the space between each tick mark denotes 1/8th of an inch in distance. To find the 1/8th-inch mark, simply look for the second tick mark (2/16 or 1/8) following the 0-inch line.
To locate 3/8 of an inch on a ruler, first, find the 1/2 inch mark on the ruler, which is typically a longer line than the others. Next, locate the 1/4 inch mark, which is usually represented by a shorter line than the 1/2 inch mark but longer than the 1/8 inch mark.
Converting an inch fraction to decimal inches is as easy as dividing the fraction. Divide the top number (numerator) by the bottom number (denominator) to find the value in inches as a decimal. You can also use a fraction to decimal calculator or the chart below.
How to read fractions of an inch on a ruler. To read fractions of an inch on a ruler, you need to locate the smaller markings between the whole inch markings. These smaller markings represent fractions such as 1/2, 1/4, 1/8, and so on. A different length of the marking indicates each fraction.
If you counted in 1/4 inches on a ruler, you'd see that the fourth line after 0 inches equals 1/4 inch, the eighth line equals 2/4 (1/2) inch, and the 12th line equals 3/4 inch. Example: Say you’re measuring a piece of cloth and the ruler ends at the fourth line after the 10-inch mark.
The next smallest marks on a ruler are 1/8ths. The red marks on these rulers are at 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, and 1. The next smallest mark, if there are any, are 1/16ths.
Reading a ruler is easy. Here's how to use and read a U.S. or English ruler. Place the end of the object you want to measure at the zero mark to the left side of the first inch mark. The longest lines on the ruler are the inch lines. These will be numbered.
When marking down a distance from a ruler, mark the whole inch, followed by a space, then the fraction of an inch. For example, 1 1/2, or 2 3/8. When entering fractions into the conversion calculators, you have to separate the whole number and the fraction with a + sign. For example, 1+1/2, or 2+3/8.