🎯 Goal
Learn to add and subtract positive and negative numbers correctly using number line reasoning and rules.
📖 Lesson Description
Signed numbers include both positives and negatives. Adding and subtracting them depends on their signs.
📠Rules
- Adding same signs: Add their absolute values, keep the sign.
- Adding different signs: Subtract the smaller absolute value from the larger, keep the sign of the larger.
- Subtracting: Change subtraction to adding the opposite, then follow addition rules.
🔎 Examples
- \(5 + (-3) = 2\)
- \((-4) + (-7) = -11\)
- \(9 - (-2) = 9 + 2 = 11\)
- \((-6) - 8 = -14\)
âœï¸ Practice
- \(7 + (-5)\)
- \((-10) + 3\)
- \(4 - (-9)\)
- \((-12) - 6\)