Modeling Adding and Subtracting Integer Operations

-9 + (-5)
T-CHART
Same signs add
Different signs subtract

• -14
• 14
• -4

-7 - 2
T-CHART
Same signs add
Different signs subtract

• -9
• 9
• 5
• -5

10+ (-4) = ?
T-CHART
Same signs add
Different signs subtract

• -6
• 6
• 14
• -14

-8 + 20
T-CHART
Same signs add
Different signs subtract

• -28
• 28
• 14
• 12

-4 + -18
T-CHART
Same signs add
Different signs subtract

• 22
• -23
• -22
• -14

-7 - 2
T-CHART
Same signs add
Different signs subtract

• -9
• 9
• 5
• -5

(-2)-(-3)
T-CHART
Same signs add
Different signs subtract

• -1
• -5
• 5
• 1

5-19
T-CHART
Same signs add
Different signs subtract

• 14
• 24
• -14
• -24

27 + (-2)
T-CHART
Same signs add
Different signs subtract

• 27
• -29
• -25
• 25

35 - (-35) 
two negatives next to each other make 1 positive
T-CHART
Same signs add
Different signs subtract

• 0
• -70
• 70
• 1