Just launch the browser on your smartphone and you can use an actual ruler. One such tool is Real size ruler for smartphones. You can use a virtual on-screen online ruler to measure the actual size of a small object in inches or centimeters if you don’t have a real ruler at hand. There are apps that allow you to measure lengths on your smartphone, but installing them is a hassle. I want to measure the length of an object on the go! But I don't have a ruler. It is important to explain that the length we are actually measuring is just the front edge and possibly show them a real die if they are making this mistake.This is a website where you can use a real size ruler on your smartphone browser! The image is showing a 3D die and some children may measure the image all the way to the right hand side, not realising that this is the depth of the die. We have included this final example to cover another mistake that children might encounter when measuring an image in a book. The die length is one more line after the 15 mm mark and so it is 16 mm long.Īgain we could have also realised that the right side of the die is 4 millimetre lines to the left of the 2 cm mark.Ģ cm is worth 20 mm and if we count down 4 places from 20, we get to 16 mm. This is 15 mm, directly in between 1 cm and 2 cm. We could have counted on 6 more millimetre lines from 10 mm to make 16 mm.Īlternatively, we know that the slightly longer line after the 1 cm mark is another 5 mm. We could have got this by counting 16 individual lines but this can be quite slow and it is easier to make a mistake in your counting. The button lines up with a line that is 2 lines away from 1 cm.ġ cm is worth 10 mm and we could have subtracted 2 mm from 10 mm to get to 8 mm.īelow is an example of measuring the side length of a die.Īgain we line the left side of the die up with the zero line on the ruler. From here we have another 3 millimetre lines.Īlternatively, we could have seen that the button is almost at the 1 cm line. We could have counted 8 lines from zero, or we could have looked at the 5 mm line that is in the middle of 0 and 1 cm. There are 8 lines and so, the button is 8 mm wide. 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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