standard_description: Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)
problem_activity: Stage 6: Add and Subtract Fractions
Required Preparation
Materials to Copy
Blackline Masters
Compare Stage 6 Cards
Compare Stage 3-8 Directions

Narrative
Students use cards with expressions with addition and subtraction of fractions with the same denominator.


aligns: no