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Hi Paul, The "$" symbol in Latex is used when you want to insert a mathematical symbols such as your subscripts' with the chemical symbols. However it also needs to be used for inserting the special mathematical symbols for 'times' and 'divide' so the line should read; 16 $\div$ 18 $\times$ 100 = 88.2 percent Richard Crampton -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html