Lesson Title: Roman Numerals
File: Interactive Math PowerPoint presentation
Do you know what CMDXXI and MCMX mean?
They are written in Roman notation. You can find numbers like this in inscriptions on buildings, faces of some clocks and in book outlines.
Ancient Romans wrote numerals that did not use place value.
There are seven symbols used in the Roman numeration system such as I, V, X, L, C, D and M with the corresponding values such as 1, 5, 10, 50, 100, 500 and 1000, respectively.
The Roman numeration system uses the principle of addition and subtraction.
When the principle of addition is used, a symbol can be used 3 times only.
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