Skip to main content
. 2013 Sep 10;4:584. doi: 10.3389/fpsyg.2013.00584
1. 13 + 1 = ____________________________________ 2. −4 + −6 = _________________________________
3. −2 + −12 = _________________________________ 4. −6 + 8 = __________________________________
5. −11 + 8 = ___________________________________ 6. 2 + −11 = _________________________________