Most Fractional Rulers are based on the English measuring system where scales are graduated in units of one inch and fractions of an inch. Decimal Rulers have graduations or marks which are based on the decimal system such as 0.5, 0.25, 0.1, 0.05, etc. Fractional Rulers have graduations or marks based on fractions, for example 1/2", 1/4" 1/8", 1/16", etc. There are two types of scales commonly used on rulers Fractional and Decimal.
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