To report on total meals go to Admin > Meals > Reports and select Dinner Numbers by Week. Set your date range and click Filter this page by dates.
This will now list how many meals were taken for each day, as well as a total for the whole date range, which can be found at the far right hand side of the table that comes up.
The Report also breaks down totals for School Provided and Own Meals (meals from home), as well as how many were Paid for and how many were Free meals.
Below is a key to what the colour coding on this report relates to.