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④小学超重点超精辟的计算总结(涉奥,3-6年级)

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④小学超重点超精辟的计算总结(涉奥,3-6年级)
计算是小学数学的基础与灵魂,抓住计算,才能在小升初角逐中一举夺魁,今天我们大概的将小学计算总结一二,与大家分享。一、整数×11——“两边一拉,中间相加”
计算:
123456789×11=?
987654321×11=?
解答:“两边一拉,中间相加”。
123456789×11=1358024679;
987654321×11=10864197531;

×99、999、…——“减1加补”
计算:
1234×9999=?
4321×9999=?
解答:“减1加补”;
1234×9999=12338766;
4321×9999=43205679;

重码数——“123123123=123×1001001”
计算:
2008×200720072007-2007×200820082008=?
解答:原式=2008×200720072007-2007×200820082008=0

轮转数——“(123+231+312)=(1+2+3)×6”=?
计算:(1234+2341+3412+4123)÷5
解答:原式=(1234+2341+3412+4123)÷5=1111×10÷5=1111×(10÷5)=1111×2=2222


计算:11111111×11111111=?
解答:第一个算式中,十位数相同,个位数的和是11,此时可以先算23×27=621,所以
23×28=621+23=644。
11111111×11111111=123456787654321。

缺8数——“12345679×9=111111111”
计算:12345679×999999999=?
解答:
12345679×999999999=12345679×9×111111111=111111111×111111111=12345678987654321

142857——“走马灯数”
142857×1=142857
142857×2=285714
142857×3=428571
142857×4=571428
142857×5=714285
142857×6=857142
142857×7=999999
填空:下列算式中不同的汉字表示不同的数字,相同的汉字表示相同的数字。

解答:如果知道走马灯数,可一下子填出来。
填空:a÷7化成小数后,小数点后至少_______个数字之和是2008,这时最小的自然数
a=________。

使数字和为2008,所以应该以2、8开头的,所以至少需要6×74+2=446(个)数字,这时a=2。
二、小数小数点的移动——目的:提取公因数、凑整
123.456×10——小数点向右移动一位
123.456×0.1——小数点向左移动一位
12.5×4.5=125×0.45
51×0.87+8.7×2.9+87×0.08+0.012×870=?
解答:原=0.87×51+0.87×29+0.87×8+0.87×12=0.87×(51+29+8+12)=0.87×100=87




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fX7z1fT87s  幼儿园  发表于 2017-3-6 10:06:50 | 显示全部楼层

In the other leg and competition

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fX7z1fT87s  幼儿园  发表于 2017-3-7 21:01:53 | 显示全部楼层

12 Junior Featherweight/

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宋佳佳  幼儿园  发表于 2017-3-24 05:12:51 | 显示全部楼层

2 midfield footwork

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D9f7BEb3Q9  小学三年级  发表于 2017-4-13 06:46:13 | 显示全部楼层

static stretching

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