

□+□=□
□+□=□
□+□=□
□+□=□
□-□=□
□-□=□
□+□=□
□-□=□
□-□=□
□+□=□
□-□=□
□-□=□
3________ 6 = 9 10________6 = 16 9________4 = 5
7________6 = 1 17________6 = 11 19________4 = 15
□+□=□
□-□=□
□-□=□
□+□=□
□-□=□
□-□=□
□+□=□
□-□=□
□-□=□