The sign rules for the addition and subtraction of integers are:

  • The positive integers are always added.
  • The negative integers are always added.
  • The positive and negative integers are always subtracted.

Solution:

Here, (+2) + (+5)

 = +7 or 7 ans.

Solution

Here, (+4) + (-1)

 = +3 or 3

Similarly, (+4) + (-7)

 = -7 (The difference holds the sign of the bigger integer.)