Aim: How can we use a chip model to represent addition and subtraction?
Homework: Prepare for tomorrow's quiz.
Do Now: Nadie has a chip board with 4 red chips. She needs to subtract 2 black chips but there are no black chips on the board. Nadie says "It is impossible to subtract 2 black chips. There are none on the board!" What can Nadie do to the chip board so that she can subtract 2 black chips? Hint: zero pairs help
Classwork: We use black (positive) and red (negative) chips to model integer addition problems.
Announcements: There will be a quiz Thursday 9/22/16! Topics will include: comparing positive and negative numbers, ordering rational numbers (including positive and negative fractions/decimals), temperature problems, number line applications, and chip models.