The bigger lines with the numbers make up the centimeters. On a metric ruler, each small mark (line) represents a mm. Most measurements in science class are done using a smaller scale then a meter which is either centimeter (cm) or millimeter (mm). In the metric system, the meter is the the standard unit for measurement. Reading Ruler Measurements – Metric System The 100 mm (10 cm), 200 mm (20 cm), 300 mm (30 cm), mm – millimeters, cm – centimeters rulers are using the metric system. Rulers can vary in length and systems, like the 6” and 12” (in or inches) ones, they are using imperial system. These type of rulers have different names such as plastic or wooden rulers, architects scales, carpenters rules, seamstress tapes, measuring tapes and yardsticks.
Like most rulers, they are mostly used in school for math, geometry and technical drawing, as well as the engineering and construction, carpentry, sewing, printing and many more other industries. These type of rulers for precision measurements may be have to be certified by NIST (National Institute Of Standards and Technology), to be more accurate, by the Dimensional Metrology Group of the US government. When it comes to accuracy the best material for a ruler has to be steel which is durable and rigid. In our case, the rulers you will find here are made to be printed on sheets of paper. Depending on the rigidity, lightweight or how often will be used, rulers can be made out of different materials such as metal, wood or plastic.
Incorrect position of ruler to measure a line with the line starting at the end of the rulerĬorrect position of ruler to measure a line with the line starting at zero.A ruler, also known as “rule” or “line gauge”, is a thin rectangular measuring device that has straight edges and length measurement markings, equidistant & parallel lines with numbers, along the edge. When drawing a line, it is also important to teach children to bridge the ruler with their supporting hand properly.Ĭhildren naturally tend to support just one end of the ruler, so when they are drawing lines it often goes wonky towards the end which is not supported. When using a ruler it is important to teach children to read from the zero line - not the end of the ruler, as many rulers have a slight space before the zero line.
Once a child is confident reading scales, then they are ready to use a ruler to draw and measure lines. 700 + 20 + 4 = 724 īefore being able to measure a length or draw a length using a ruler, a child must first be able to read a scale accurately.Īt second grade, children are introduced to scales going up by halves and they should be able to read scales to the nearest half-unit.
They learn to count up to higher numbers like 20 or 30.Įventually, they manage to learn to count up to 100, and that numbers up to 100 can be split up into tens and ones. Next, they learn to count objects and numbers of things that are in front of them and learn 1:1 correspondence when counting.ĭuring this stage children are still learning their number sequence, and that numbers continue past 10. When children first learn to count, they learn the number sequence, usually up to ten, but without an understanding of what the numbers mean. Counting is one of the very first skills young children learn to do in their math journey.
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