Adding Integers with Algebra Tiles

Modeling Integer Operations

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When we add or subtract integers, whether we add or subtract depends on the signs.
- Same signs: we add and end up with more of the same.

- Different signs: we subtract, and the sign depends on the larger number.

Multiple Choice

Which equation is represented by the model?

• 8 + (-5) = 3
• -8 + 5 = -3
• 8 + 5 = 13
• -8 + (-5) = -13

Multiple Choice

Which equation is represented by the model?

• 9 + 4 = 13
• 9 + (-4) = 5
• -9 + 4 = -5
• -9 + (-4) = -13

Multiple Choice

• -5 + 3 = -2
• 5 + (-3) = 2
• 5 + 3 = 8
• -5 + (-3) = -8