Changes

Laws of Arithmetic

2 bytes added, 16:14, 7 December 2020

→‎Skill Levels

|-

| 1-2 || 1 + 8 = 8 + ?

(2 + 1) + 3 = ? + (2 + 1)

|| Applying the commutative

|-

| 4-5 || (4 + ?) + 3 = 4 + (3 + 5)

(6 + 9) + 5 = 5 + (? + 9)

|| REVIEW of Levels 1 through 3.

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