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. 2013 Sep 10;4:584. doi: 10.3389/fpsyg.2013.00584
1. 6 × 7 = ____________________________________ 2. −4 × −9 = _________________________________
3. −8 × −3 = _________________________________ 4. −10 × 5 = _________________________________
5. 6 × −9 = ___________________________________ 6. −2 × 7 = __________________________________