8,732
edits
Changes
→Skill Levels
(2 + 1) + 3 = ? + (2 + 1)
|| Applying the commutative
property of addition to
problems with addends of 0
through 9.
|-
| 3 || (2 + 1) + 4 = ? + (1 + 4)
|| Applying the associative
property of addition to
problems with addends of 1
through 9.
|-
(6 + 9) + 5 = 5 + (? + 9)
|| REVIEW of Levels 1 through 3.
Applying both the associative
and commutative properties
of addition to problems with
addends of 1 through 9.
|-
