We will measure the length of this pencil by lining its left tip up with the zero mark. The final example of measuring centimetres using a ruler is given below. This ruler measure in two different units of length, inches on one side (English ruler) and centimeters on the other side (metric ruler). The right hand side of the eraser lines up with the 4 on the ruler and so, the length of the eraser is 4 cm. We line up the left of the eraser with the zero line on the ruler. Here is another example of measuring centimetres with a ruler. This means that the pencil sharper is 1 cm across in width. The pencil sharpener’s right edge lines up with the 1. Remember to line up the left edge of the pencil sharpener with the zero line. We will measure the length of this pencil sharpener. Here is our first example of measuring centimetres using a ruler. When teaching measuring with a ruler it is important to stress that the measurement is taken from the zero mark and not the edge of the ruler. We always start from the ‘0’ line on the ruler and we line our objects up with this point.Ī common mistake when learning to measure objects with a ruler is to not line up the object with the zero correctly. It is important to measure objects using the measurement lines on the ruler. There are many different types of measuring rulers, available in different shapes, sizes and materials. The ruler itself is slightly longer than 15 cm, however the distance from the 0 line to the 15 line is 15 cm. A ruler is an instrument used to measure distances, degrees and determine straight lines. We typically write centimetres as ‘cm’ for short, with a space between the number and the ‘cm’. Some rulers have ‘inches’ on the other side and we cannot compare centimetres to inches as easily. It has numbers from 0 to 15 and each number is a centimetre apart from the number next to it.Ĭentimetres are one of the common metric units of measurement and they are easy to compare to millimetres, metres and kilometres when we describe how long a distance is.Īll of these words end in ‘metres’ so we know that we can compare them. The big long hash with numbers opposite to the centimetre is known as the inches. Centimetres are units of measurement that we commonly see on rulers and are written with the abbreviation ‘cm’.Ĭentimetres help to describe how long an object is.īelow is a 15 centimetre ruler. Ruler Measurements in Inches - Inch is bigger than the centimetre.
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