吴青两位数乘两位数课件.ppt
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1、,云台小学 吴 青,两位数乘两位数(一),17,12,1712 =1710 + 172 =170 + 34 =204,小丁丁:,1712 =173 4 =51 4 =204,小巧:,1712 =2012 - 312 =240 - 36 =204,小亚:,1712 =812 + 912 =96+108 =204,小胖:,17,13,17,13,1713 =1710 + 173 =170+51 =221,1710,10,3,173,17,13,10,7,1713 =1013 + 713 =130+91 =221,1013,713,17,13,20,7,1713 =1720 - 177 =340 -
2、 119 =221,1720,177,17,13,20,3,1713 = 2013 - 313 = 260 - 39 = 221,2013,3 13,4337 =4330 + 437 =1290 + 301 =1591,用小丁丁的方法试一试:,4337,3129 =3120 + 319 =620 + 279 =899,3129, 1729 =1720 + 17( ), 4773 =47( ) +47( ), 5367 = 53 53 =3180+371 =3551,填空:,9,60+,7,25,25,1,24,2425 =2525 - 125 =625 - 25 =600,已知:25 25=625,25,25,1,2625 =2525 + 125 =625 + 25 =650,已知:25 25=625,25,25,1,24,2426 =2525 - 125+124 =625 - 25 + 24 =600+24 =624,1,已知:25 25=625,53 =530 + 53 =583,34 =340 + 34 =374,有趣的计算,53,11,11,5,3,两头一拉,,8,中间相加。,6211 7111,谢谢!,
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