Positives & Negatives

rough outline (~6 sections)

(Each one, 1st explain why, then give the “rule” for how it works.)

• What are negative numbers?
  • opposite of positives; additive inverse
• Adding with negative numbers
  • pos + pos —> bigger pos
  • neg + neg —> bigger neg (NOT “greater”)
  • use colors for + & — to explain
  • use number line (elevator thing) to explain
• Subtracting with negative numbers
  • thinking of subtracting as “getting rid of”
  • thinking of subtracting as “adding the opposite”
• Multiplying with negative numbers
  • opposite of the opposite
• Dividing with negative numbers
  • relate to multiplication
• Bonus: What about Zero ????
  • adding: additive identity
  • subtracting:
  • multiplying: none of …….
  • dividing:
  • is zero positive or negative?