口算：700×4=600×7=486+14=56÷7=465×0=18÷5=123×2=972-200=495×3≈503×6≈712×4≈289×4≈59-29=1-13=57+27=716

Question

口算： 700×4=	600×7=	486+14=	56÷7=
465×0=	18÷5=	123×2=	972-200=
495×3≈	503×6≈	712×4≈	289×4≈
(5)/(9) - (2)/(9) =	1- (1)/(3) =	(5)/(7) + (2)/(7) =	(7)/(16) + (4)/(16) =

Answer 1

700×4=2800	600×7=4200	486+14=500	56÷7=8
465×0=0	18÷5=3…3	123×2=246	972-200=772
495×3≈1500	503×6≈3000	712×4≈2800	289×4≈1200
(5)/(9) - (2)/(9) = (1)/(3)	1- (1)/(3) = (2)/(3)	(5)/(7) + (2)/(7) =1	(7)/(16) + (4)/(16) = (11)/(16)