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Please watch the videos on the home page of this website. Also, practice measuring distances in as many units (cm, m, inches, feet, etc) as you can think of. Try converting between these units to give yourself a challenge (metres to centimetre or inches to feet). You could also learn how to use a web based converting calculator to convert between imperial measures (yards) and metric measures (metres). This unit is covered in chapter 5 of the Nelson Math Text.