Aim: How can we predict whether a sum will be positive, negative, or zero?
Homework: Accentuate the Negative, Finish Problem 2.1 Parts A-E (pp.32-33)
Do Now: Use integer chips to model each.
1. -5 + 3 = 2. -4 + (-9)=
Classwork: Today's class was about discovering the addition algorithm. The past few lessons, students have been using integer chips and number lines to find values of positive and negative numbers. Today, we bridged that understanding with a more abstract addition "rule."
When adding integers...
..if the signs are the same, add the absolute values and keep the same sign
..if the signs are different, subtract the absolute values and keep the sign of the greater absolute value
Click on "addition" and "negatives" on the left menu bar. You can also increase the difficulty level and number of questions. Try to set a benchmark with correct answers in a given time and see if you can beat that.