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第2课时 整百数加、减几百几十1.试一试,说出口算的思考过程900600 200700700500 300400700-100 210-50900-10 380-2902.抢答题,看谁算得又对又快。800300 70030 730450600100 6080 250360900200 59040 3202803.算一算,比一比,在里填上“”、“”或“”。100300700200 250310500380190200 27030640340答案提示1.300,900,200,700,600,160,890,902.500,670,280,700,140,610,700,630,403.
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