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Better Lesson
Better Lesson: Using a Pattern to Solve a Problem
Patterns are prevalent in all levels of math. Common Core Standards expect students to be able to use structure - like that found in repeating the patterns of odd and even numbers or counting by 5s or 10s - to solve problems (MP7).
Math Aids
Math Aids: Even and Odd Worksheets
Great resource to practice and strengthen math skills pertaining to evens and odds. Math worksheets are printable, may be customized, and include answer keys.
Purple Math
Purplemath: Function Notation & Evaluating at Numbers
Presents a lesson on function notation. Includes interactive widget for evaluating functions.