its the identity rule
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The smallest division on a meter rule, also known as a meter stick, is typically 1 millimeter (mm). This means that each small line or marking on the meter rule represents a distance of 1 mm. The meter rule is divided into centimeters (cm) and millimeters (mm), with each centimeter divided into 10 millimeters. The smallest division of 1 mm allows for precise measurements to be taken using the meter rule.
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Actually, zero divided by zero is a non-real number, not two. This has to do with some complicated rules of math, but the simplified rule is division by zero is not possible.
The order of operations rule says to do the division efore the subtraction: 16 - 12/3 = 16-4 = 12.
If it were not true, it would not have become the rule!