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900-90= 260+350= 212×4= 72÷8= 28-14÷2= 24×5= 55+35= 68+29= 1001+997≈ 21+579×0= 204×9= 37-19= 2×303= 298×3≈ 120-20×6= + = 1- = + = - = + =1-
①263+827
②75×9
③543-68
④358-(196+127)
⑤*806-329
⑥399×4
⑦(404+56)×3
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