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Mathematician Robert Recorde invented the "equal" sign in 1557. He chose 2 parallel lines to best represent equality. The "+" and "-" signs for plus and minus were used in the 15th century to mark boxes of freight over- or underweight.

# Four-step Problems Worksheets

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Basic Lesson
Demonstrates the rule set to follow when performing arithmetic operations. Practice problems are provided.
Standard: Math 2
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Intermediate Lesson
Explains how to attack the variables in a four-step order of operations problem. Practice problems are provided.
Standard: Math 2
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Independent Practice 1
Contains 20 four-step problems. The answers can be found below.
Standard: Math 2
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Independent Practice 2
Features another 20 four-step problems.
Standard: Math 2
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Homework Worksheet
12 four-step problems for students to work on at home. Example problems are provided and explained.
Standard: Math 2
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Four-step Problems Quiz
10 four-step problems. A math scoring matrix is included.
Standard: Math 2
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Answers for the homework and quiz.
Answers for both lessons and both practice sheets.

What is the Deal with PEMDAS?: Order of Operations
It is called the order of operations, but why the PEMDAS acronym?
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Solve Math Problems by Using an Outline: Plan of Action
A problem solving outline provides a strategy for solving even the most difficult problems.
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