9b_Talnafræði
__1. (1+2) + 3 = 1 + (2 + 3)A. Víxlregla í samlagningu
__2. 3(4) = 4(3)B. Samlagningarhlutleysa
__3. 5(1/5) = 1C. Margföldunarhlutleysa
__4. 5*0 = 0D. Tengiregla
__5. 7(x + 12) = 7x + 84E. Dreifiregla
__6. 16 + 0 = 16F. Samlagningarandhverfa
__7. 19 + (-19) = 0G. Víxlregla í margföldun
__8. a(b*c) = (a*b)cH. Margföldunarandhverfa
__9. a*1 = aI. Tengiregla í margföldun
__10. a + b = b + aJ. Margföldun með tölunni núll
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