![]() We count the number of lines that we have until the lines on the ruler line up with the rightmost part of the button. Here we have a button and we will measure its width by lining up the leftmost part of the button with the zero line on the ruler as shown below. Our first example will be an object with a length that is less than 1 cm long. We will now look at an example of measuring an object in millimetres. We can see that we are on the 1 cm line, marked with a ‘1’.Įvery centimetre on a ruler is worth 10 mm. Once we have counted 10 of the smallest lines, we have counted 10 mm. Once we count past 5 mm, we can count 6 mm, 7 mm, 8 mm, 9 mm and eventually get to 10 mm below. The line is slightly longer so that it stands out and we can read half a centimetre more easily. ![]() This line is slightly longer than the 1 mm, 2 mm, 3mm and 4 mm lines and slightly less than the 0 and 1 cm lines. We can count further and this line below is 5 mm. Here is the second small line and so, this is 2 mm away from zero. We can continue to count these lines on our ruler. Since this is the first line we come to after 0, it is 1 mm. The two red lines marked are one millimetre apart. Remember that when measuring a length with a ruler, we start from the first line on the left of the ruler, which is the zero line. Millimetres are often abbreviated to just ‘mm’ for short in the same way that centimetres are abbreviated to ‘cm’.Įach number that is written on a ruler is one centimetre in length.īetween each of the centimetre lines, there are many smaller lines that do not have numbers written on them.Įach of these smallest lines are millimetres and each line is one millimetre in length away from the line next to it.īelow is a ruler with one millimetre (or 1 mm) shown. There are 1000 millimetres in one metre and ten millimetres in one centimetre. A millimetre is a measurement of length, which is one tenth of a centimetre long.
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