Unit 23
Teroka Ria
Rima Sifar
Baca rima ini dengan kuat sambil bertepuk tangan.
Kemudian jawab soalan pantas!
探索活动 = Teroka Ria；口诀 = rima
这个活动用一段有节奏的口诀帮助记住：乘 10、100、1 000 时要补几个 0。先跟着节奏拍手念口诀，再做几道快问快答，看看能不能很快说出答案。
例子：念到“乘一百”时，就想到“补两个零”。
注意：口诀只是帮助记忆，做题时还是要数清楚 0 的个数。
fun exploration = Teroka Ria; rhyme = rima
This activity uses a rhythmic rhyme to help us remember how many zeros to add when multiplying by 10, 100 and 1 000. Clap and say the rhyme first, then try some quick questions to see how fast you can answer.
Example: when the rhyme says times one hundred, think add two zeros.
Watch out: the rhyme helps you remember, but still count the zeros carefully in each question.
Rima Sifar
Baca sambil bertepuk
Satu tepukan untuk setiap baris.
👏 Darab sepuluh, satu sifar di belakang,
👏 Darab seratus, dua sifar datang,
👏 Darab seribu, tiga sifar berbaris,
👏 Kira sifar dahulu, jawapan pun manis!
念口诀 = baca rima
口诀的四句分别提醒我们：乘十补一个零，乘一百补两个零，乘一千补三个零；最后一句提醒先数清楚乘数有几个零，再写答案。每念一句拍一次手，多念几次就记住了。
例子：念完口诀后，34 × 1 000 就能很快说出 34 000。
注意：零要补在原来那个数的后面。
say the rhyme = baca rima
The four lines remind us: times ten adds one zero, times one hundred adds two, times one thousand adds three, and count the zeros first before writing the answer. Clap once for each line and say it a few times until you remember it.
Example: after the rhyme, 34 × 1 000 quickly becomes 34 000.
Watch out: the zeros go after the number you started with.
Soalan pantas 1
560 × 100 = ?
乘一百 = darab seratus
口诀第二句说：乘一百，两个零来到。题目里的数末尾本来就有一个 0，这个 0 要保留，再在它后面补上两个新的 0。补好以后，数一数整个数末尾一共有几个 0，看看对不对。
例子：730 × 100 = 73 000。
注意：原来的 0 和新补的 0 都要写，漏写一个，得数就只变成十倍。
times one hundred = darab seratus
The second line of the rhyme says two zeros come when we multiply by one hundred. The number in this question already ends in a zero; keep that zero and write two new zeros after it. Then count all the zeros at the end to check.
Example: 730 × 100 = 73 000.
Watch out: write both the old zero and the new ones; missing one makes the number only ten times bigger.
Soalan pantas 2
81 × 1 000 = ?
乘一千 = darab seribu
口诀第三句提醒：乘一千，三个零排成一行。所以在这个两位数后面补上三个 0，可以一边写一边数“一、二、三”，数目就不会错。
例子：52 × 1 000 = 52 000。
注意：乘一千和乘一百只差一个 0，写完要回头对照乘数再数一次。
times one thousand = darab seribu
The third line of the rhyme reminds us that three zeros line up when we multiply by one thousand. Write three zeros after this two-digit number, counting one, two, three as you write so you do not lose one.
Example: 52 × 1 000 = 52 000.
Watch out: times one thousand and times one hundred differ by just one zero, so look back at the multiplier and count again.
Soalan pantas 3
□ × 100 = 90 400. Apakah □?
倒过来想 = fikir terbalik
这题知道乘一百以后的结果，要找原来的数。乘一百会在末尾补两个 0，所以倒回去只要把末尾的两个 0 去掉。夹在中间的 0 是原来就有的，要留下。
例子：□ × 100 = 30 800 → □ = 308。
注意：只能去掉末尾的 0；中间的 0 一去掉，数就变了。
think backwards = fikir terbalik
Here we know the result after multiplying by one hundred and must find the starting number. Times one hundred adds two zeros at the end, so undo it by removing only the last two zeros. A zero in the middle was there from the start and must stay.
Example: □ × 100 = 30 800, so □ = 308.
Watch out: only zeros at the end may be removed; taking away a middle zero changes the number.
Ringkasan
Syabas!
×10 · ×100 · ×1 000
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