Addition
Subtraction
Add the
opposite
 Change – to +
 Change 2nd number to its opposite
 Go back to addition rules!
Example: 3 - 5
-8 - (-2)
3+ -5
-8 + 2
Different
Signs
 Subtract & keep the sign of the
bigger number
Same
Signs
 Add & keep the sign
Example: 3 + -5 = ?
Example: -3 + -5 = ?
-Subtract: 5 – 3 = 2
-add: 5 + 3 = 8
-Keep sign of bigger number: -2
-Keep the sign: -8
Addition
Subtraction
Add the
opposite
 Change – to +
 Change 2nd number to its opposite
 Go back to addition rules!
Example: 3 - 5
-8 - (-2)
3+ -5
-8 + 2
Different
Signs
 Subtract & keep the sign of the
bigger number
Example: 3 + -5 = ?
Same
Signs
 Add & keep the sign
Example: -3 + -5 = ?
-Subtract: 5 – 3 = 2
-add: 5 + 3 = 8
-Keep sign of bigger number: -2
-Keep the sign: -8