Mastering Integer Addition and Subtraction

Front

Positive + Positive

Back

and keep the sign

Front

Negative + Negative

Back

and keep the sign

Front

Positive + Negative

Back

and take the sign of the larger absolute value

Front

Negative + Positive

Back

and take the sign of the larger absolute value

Front

Back

latex="2">

Front

Back

latex="-3">

Front

Back

latex="-10">

Front

Back

latex="15">

Front

Subtracting a positive

Back

as adding a negative

Front

Subtracting a negative

Back

as adding a positive