Adding dollar bills

Front

$3 + $2 =

Back

$5

Front

$2 +$2 =

Back

$4

Front

$3 + $3 =

Back

$6

Front

$1 + $3 =

Back

$4

Front

$3 + $1 =

Back

$4

Front

$4 + $2 =

Back

$6

Front

$4 + $4 =

Back

$8

Front

$3 + $4 =

Back

$7

Front

$5 + $4 =

Back

$9

Front

$1 + $1 =

Back

$2