Since screen sizes differ, you need to adjust the size to ensure that the ruler measurements are accurate. If it isn’t accurate then you need to change your printer’s settings. When you have printed your ruler, take a store-bought ruler or a tape measure to check the accuracy.You can laminate printable paper rulers if you want them to last for a long time or if you want to write on them with wipe-off markers.Print on standard paper for one-time use or on card stock if you want your ruler to last longer.The printer setup is important to ensure that your paper ruler is accurate. Set your printer’s page size to letter or A4 depending on the ruler template you downloaded.Download the printable ruler PDF or image file.They can draw on the ruler, which will help them understand how to use it and how to read the measurement. You can create a printable millimeter ruler from the cm ruler printable above, but you count the shorter lines only (not the longer cm lines).Ī printable paper ruler is useful when you teach kids measurements. This mm ruler printable shows measurements in millimeters. Height is commonly measured in centimeters outside of countries like the United States.This actual size printable ruler cm is for those who follow the metric system. Learning some of the more commonly used metric prefixes, such as kilo-, mega-, giga-, tera-, centi-, milli-, micro-, and nano-, can be helpful for quickly navigating metric units.Ĭurrent use: The centimeter, like the meter, is used in all sorts of applications worldwide (in countries that have undergone metrication) in instances where a smaller denomination of the meter is required. ![]() Metric prefixes range from factors of 10 -18 to 10 18 based on a decimal system, with the base (in this case the meter) having no prefix and having a factor of 1. History/origin: A centimeter is based on the SI unit meter, and as the prefix "centi" indicates, is equal to one hundredth of a meter. Centimeterĭefinition: 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 also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens. 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.Ĭurrent use: The inch is mostly used in the United States, Canada, and the United Kingdom. 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. There have been a number of different standards for the inch in the past, with the current definition being based on the international yard. History/origin: The term "inch" was derived from the Latin unit "uncia" which equated to "one-twelfth" of a Roman foot. ![]() ![]() There are 12 inches in a foot and 36 inches in a yard. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. ![]() Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement.
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