**Addition —**

- (+3) + (+5) = (+8) – The signs are both plus, thus add the digits and write a plus value.
- (-3) + (+5) = (+2) – The signs are different, thus take the difference between the digits and write the sign of the larger digit.
- (-3) + (-5) = (-8) – The signs are both minus, thus add the digits and write a negative value.
- (+3) + (-5) = (-2) – The signs are different, thus take the difference between the digits and write the sign of the larger digit.

**Subtraction —**

- (+3) – (+5) = +3 – 5 = (-2) – Change the sign before the second digit. Take the difference between the digits and write the sign of the larger digit.
- (-3) -(+5) = -3 – 5 = (-8) – Change the sign before the second digit. Add the digits and write a negative value.
- (-3) – (-5) = -3 +5 = (+2) – Change the sign before the second digit. Take the difference between the digits and write the sign of the larger digit.
- (+3) – (-5) = +3 +5 = (+8) – Change the sign before the second digit. Add the digits and write a positive value.

**Multiplication —**

- (+6) x (+3) = (+18) – The signs are both plus, thus multiply and add a plus value.
- (+6) x (-3) = (-18) – The signs are different, thus multiply and add a minus value.
- (-6) x (-3) = (+18) – The signs are both minus, thus multiply and add a plus value.
- (-6) x (+3) = (-18) – The signs are different, thus multiply and add a minus value.

**Division —**

- (+6) ÷ (+3) = (+2) – The signs are both plus, thus divide and add a plus value.
- (+6) ÷ (-3) = (-2) – The signs are different, thus divide and add a minus value.
- (-6) ÷ (-3) = (+2) – The signs are both minus, thus divide and add a plus value.
- (-6) ÷ (+3) = (-2) – The signs are different, thus divide and add a minus value.

**Note:** Corrections have been made in the Division part September 17, 2010.