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Unit 18 · Teroka Ria
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Unit 18

Teroka Ria

Susunan penambah boleh ditukar tanpa mengubah jumlah.

Teroka Ria
Langkah 1

Tukar susunan

Susunan penambah boleh ditukar tanpa mengubah jumlah.

120 + 80 + 300 = 300 + 120 + 80
Tukar susunan = 交换顺序
加法的顺序可以换,和不会变。120、80、300 不管怎么排,加起来都是 500。
例子:45 + 210 + 55 = 310,换成 210 + 45 + 55 = 310,也一样。
注意:交换顺序只适用于加法,减法换了顺序答案就不同。
Tukar susunan = Change the order
In addition, the order can change without changing the total. 120, 80 and 300 make 500 in any order.
Example: 45 + 210 + 55 = 310, and 210 + 45 + 55 = 310 too.
Watch out: Changing the order only works for adding; in subtraction it changes the answer.
Langkah 2

Gabung pasangan mudah

Cari pasangan yang membentuk jumlah mudah seperti 100, 200 atau 500.

135 + 65 = 200
Gabung pasangan mudah = 先加容易的一对
在几个数里找能凑成 100、200 或 500 的一对先加。135 + 65 = 200,因为个位 5 + 5 = 10,十位 3 + 6 + 1 = 10。先凑成整百再加其余的数,心算会比较快,也比较不容易出错。
例子:240 + 160 = 400,再 400 + 75 = 475。
注意:凑整时别忘了个位进上来的 1。
Gabung pasangan mudah = Join an easy pair
Look for a pair that makes 100, 200 or 500 and add it first. 135 + 65 = 200, because 5 + 5 = 10 ones and 3 + 6 + 1 = 10 tens.
Example: For 240, 160 and 75: first 240 + 160 = 400, then 400 + 75 = 475.
Watch out: When making a whole number, remember the 1 carried from the ones.
Langkah 3

Buktikan jumlah sama

Kira dengan dua susunan berlainan dan bandingkan jawapannya.

cara A = cara B
Buktikan jumlah sama = 证明和相同
用两种不同顺序各算一次,比较答案。两种算法得到同一个和,就证明换顺序没有改变总数,也顺便检查有没有算错。
例子:A:90 + 110 = 200,200 + 35 = 235;B:35 + 90 = 125,125 + 110 = 235。
注意:两种方法答案不同,表示其中一种算错了。
Buktikan jumlah sama = Prove the totals match
Work the sum in two different orders and compare. If both ways give the same total, the order did not matter, and you have also checked your work.
Example: Way A: 90 + 110 = 200, then 200 + 35 = 235. Way B: 35 + 90 = 125, then 125 + 110 = 235.
Watch out: If the two ways disagree, one of them has a mistake to find.
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Cuba sendiri

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Pasangan manakah paling mudah ditambah dahulu bagi 128 + 72 + 300?

Pasangan paling mudah = 最容易的一对
这题给 128、72 和 300 三个数,问哪两个先加最容易。看每一对的个位能不能凑成 10,加起来是不是整百。能凑成整百的那一对最好算。
例子:46、300、54 里,个位 6 + 4 = 10,所以 46 + 54 = 100。
注意:比的是哪一对能凑整,不是哪一对数字最小。
Pasangan paling mudah = Easiest pair
The question gives 128, 72 and 300 and asks which two are easiest to add first. Look for a pair whose ones digits make 10 so the pair becomes a whole hundred.
Example: In 46, 300 and 54, the ones 6 + 4 = 10, so 46 + 54 = 100.
Watch out: The easiest pair is the one that makes a whole number, not the one with the smallest numbers.
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Cuba sendiri

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245 + 155 + 100 = __

Jumlah 245, 155, 100 = 三个数的总和
这题算 245 + 155 + 100。先找好朋友数:245 和 155 的个位 5 + 5 = 10,可以凑成整百,再加 100。把能凑整的两个数先放在一起加,剩下的数最后再加上去。
例子:325 + 75 = 400,400 + 200 = 600。
注意:凑整时十位也要加上进位,别把 245 和 155 的和算少了 10。
Jumlah = Total
The question is 245 + 155 + 100. Look for a friendly pair: 245 and 155 have ones that make 10, so together they make a whole hundred; then add 100.
Example: For 325, 75 and 200: 325 + 75 = 400, then 400 + 200 = 600.
Watch out: Include the carried ten when you add 245 and 155.
Ringkasan

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Ingat: tukar susunan; gabung pasangan mudah; buktikan jumlah sama.

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