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【有奖解答】印度式乘法口诀 by ericet

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· @ericet · (edited)
$2.13
【有奖解答】印度式乘法口诀
<center><img src="https://cdn.pixabay.com/photo/2016/11/29/01/16/abacus-1866497_960_720.jpg" alt="" /><br/>
(Image source: <a href="https://cdn.pixabay.com/photo/2016/11/29/01/16/abacus-1866497_960_720.jpg">pixabay</a>)
</center>
大学时有很多来自印度的同学
有一次课堂上有道算数是14x18=?
大家都在掏出计算机或者拿出笔纸计算的时候,有个印度同学脱口就说,252.

课后,我就去问了这位印度同学,你是怎么这么快就可以心算出来的。
这位印度同学说,在印度他们需要背诵19x19的乘法口诀。

我们国内小学只背诵9x9的乘法口诀,19x19的口诀倒是新鲜了。
他分享了他是怎么算出14x18=252的步骤。

14    x   18
(被乘数)  (乘数)

<ul>
<li>第一步:把被乘数跟乘数的个位数相加
14+8=22</li>
<li>第二步:把第一步的答案乘以10
22x10=220</li>
<li>第三步:把乘数的个位数乘以被乘数的个位数
8x4=32</li>
<li>第四步:被第二步和第三步的答案相加
(14+8)x10+(8x4)=252</li>
</ul>

这套方法适用于19x19以内的乘法。

举个例子,算19x12=?
根据上面的方法:(19+2)x10+(9x2)=228

再举个例子,算17x15=?
根据上面的方法:(17+5)x10+(7x5)=255

好了,现在到你们来算了。
按照上面的口诀,算<strong>18x16=?</strong>,最快<strong>算出答案并且附上步骤</strong>的可以获得1 SBI的奖励。 <br /><center><hr/><em>Posted from my blog with <a href=&#039;https://wordpress.org/plugins/steempress/&#039;>SteemPress</a> : http://ericet.vornix.blog/2018/12/22/%e3%80%90%e6%9c%89%e5%a5%96%e8%a7%a3%e7%ad%94%e3%80%91%e5%8d%b0%e5%ba%a6%e5%bc%8f%e4%b9%98%e6%b3%95%e5%8f%a3%e8%af%80/ </em><hr/></center>         
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vote details (257)
@angelina6688 ·
居然还有19*19乘法表( ˘•ω•˘ )

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@ericet ·
是啊,印度人的数学也很好的。还有其他口诀,下回分享

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@angelina6688 ·
所以是不是真的白种人数学最差?

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@annepink ·
哎呀😣居然被鸡鸡抢先了  我也会呀🤔
才看到😅

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@ericet ·
下回还有,也是送分的。萍萍记得早来

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@berniesanders ·
https://steemitimages.com/0x0/https://cdn.steemitimages.com/DQmcT1jZVNML2HJYnzhgJdE2hjGpRe7SXZ23VBcTA63R8of/BERNIE%20GIF.gif<br><br> Merry Christmas, enjoy the vote!
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@cherryzz ·
要做数学题,我一定会算错的
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@cnbuddy ·
你今天过的开心吗?新人吗?[《steemit指南》](http://steemh.org/)拿一份吧,以免迷路; 另外一定要去 @team-cn 的新手村看看,超级热闹的大家庭。如果不想再收到我的留言,请回复“取消”。
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@julian2013 ·
(18+6)x10+(8x6)=288

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👍  
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@ericet ·
恭喜机机获得1 sbi @teamcn-shop

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@teamcn-shop ·
@ericet给您叫了一份外卖!

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@julian2013 ·
没想到双休日这么冷清啊!

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@ericet ·
是啊,这才叫送钱的活动。居然没人参加

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@julian2013 ·
多谢村龙🤓🤓

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@kadishakho ·
😄數學爛透了

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@ericet ·
这个很简单的,按照步骤来,多试几次就熟了

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@steem-ua ·
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@steemstem ·
$0.91
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vote details (2)
@ericet ·
Thank you! Voted both stem.witness and curie

Posted using [Partiko iOS](https://steemit.com/@partiko-ios)
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@verifyme ·
@ericet You have received a 100% upvote from @botreporter because this post did not use any bidbots and you have not used bidbots in the last 30 days!

Upvoting this comment will help keep this service running.
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