8,732
edits
Changes
→Skill Levels
through 9.
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| Example 4-5 || Example (4 + ?) + 3 = 4 + (3 + 5)(6 + 9) + 5 = 5 + (? + 9) || ExampleREVIEW of Levels 1 through 3.Applying both the associativeand commutative propertiesof addition to problems withaddends of 1 through 9.
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| Example || Example || Example
