Integer Rules and Operations

In Addition if the signs the are the same we....

• Add

• Subtract

• Keep Common Sign

• Take sign of number with greater absolute value

In addition if both numbers are positive

• The sum is positive

• The sum is negative

• Add

• Subtract

In addition if the signs are different

• add

• subtract

• the sum is always positive

• the sum is always negative

• take sign of number with greater absolute value

In addition if the 1st number is positive and 2nd negative

• The answer is always positive

• The answer is always negative

• add

• subtract

• take sign of number with greater absolute value

Match the following

• -8

• 10 + (-7)

• 3

• -2 + 10

• 12

• 5 - (-7)

• 8

• -4 - 4

• -12

• -16 +4

Match the following with the correct operation and sign of the answer.

• add, negative

• -762 + (-481)

• subtract, negative

• 3 + 5

• add, positive

• -717 + 927

• subtract, positive

• -1239 + 904

When you subtract a negative number we add its ​ ​ (a)   .

• opposite

• inverse

If I am subtracting integers, I need to change the problem to addition by ​ ​ (a)   ​ the ​ (b)   ​

• opposite

• subtracting

• same sign

• adding

In addition if the first number is negative

• Always add

• Always subtract

• Add if both negative

• Subtract if the other number is positive

• Take sign of number with greater absolute value

In multiplication if both numbers are negative

• always positive

• always negative