三年级数学下册2《除数是一位数的除法》口算除法课后练习新人教版.doc

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1口算除法1直接写出得数。2107= 45009=8008= 2403=6309= 21007=30006= 72009=24006= 6003=633= 888=2估算。(1)567 的商是( )位数;462 的商是( )位数。(2)250 个月饼,每 5 个装一盒,可以装( )盒。3大象的寿命是袋鼠的 4 倍,是青蛙的 8 倍。大象的寿命大约是 80 年 青蛙的寿命大约是( )年 袋鼠的寿命大约是( )年4.公园运来 180 盆花,准备摆在 3 个花坛里,平均每个花坛摆多少盆?5三年级学生去农场劳动,女生去了 56 人,男生去了 24 人,每 4 人分成一组,一共可以分成多少组?培优天地6找出下面每组数的规律,在( )里填上合适的数。(1)3 6 12 24 ( )(2)128 64 32 16 ( )(3)2 7 22 67 ( )(4)8 24 12 36 1854 27 ( )2答案1. 30 500 100 80 70 300 500 800 400 200 21 112(1)一两 (2)503. 10 204. 1803=60(盆)5. 56+24=80(人) 804=20(组)6. (1)48 (2)8 (3)202 (4)81

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