Susan Dorrington Professional Editor and Proofreader

The word **per **is used to mean ‘for each’. Here is an example:

The following calculation shows you how to work out the number of cakes made**per **baker. (The calculation will divide the total number of cakes by the total number of bakers to get one figure for one baker.)

The word**by **indicates the use of a parameter. Here is an example:

The next table shows you the number of cakes made**by** baker. (In this case, 'baker' is a parameter. The table contains a list of many bakers. For each baker, the number of cakes that baker made is given.)

The following calculation shows you how to work out the number of cakes made

The word

The next table shows you the number of cakes made

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