Unit 28

Teroka Ria

Kenal pasti kedua-dua faktor sebelum mengira hasil darab.

Langkah 1

Baca soalan dengan lengkap

Kenal pasti kedua-dua faktor sebelum mengira hasil darab.

faktor × faktor = hasil darab

Faktor dan hasil darab = 因数与乘积
乘法算式里，相乘的两个数叫因数，算出来的答案叫乘积。算之前先把两个因数都看清楚。例如 7 × 8 和 7 × 9 只差一个因数，乘积却差 7。
例子：因数 4 和 9：4 × 9 = 36，36 是乘积。
注意：看题要看完整，6 和 9、1 和 7 容易看错。

Faktor dan hasil darab = Factors and product
In a multiplication, the two numbers being multiplied are factors and the answer is the product. Read both factors carefully before you start. For example, 7 × 8 and 7 × 9 differ by just one factor, yet their products differ by 7.
Example: The factors 4 and 9 give 4 × 9 = 36, so 36 is the product.
Watch out: Digits like 6 and 9 are easy to misread, so look closely.

Langkah 2

Gunakan pola atau fakta songsang

Jika terlupa, gunakan tambah berulang, pola sifir atau tukar susunan faktor.

pola · tambah · tukar susunan

Pola atau tukar susunan = 规律或对调
忘了某个乘法时，可以用重复加法、乘法表的规律，或把两个因数对调。哪个方便就用哪个。例如 9 × 3 可对调成 3 × 9 = 9 + 9 + 9 = 27。
例子：忘了 6 × 4，就从 5 × 4 = 20 再加一个 4：20 + 4 = 24。
注意：顺着规律加时，每次加的是那个乘法表的数，不是加 1。

Pola atau tukar susunan = Pattern or swapping
If you forget a fact, use repeated addition, the table pattern, or swap the two factors. Pick the easiest one. For 9 × 3, swap it to 3 × 9 and work out 9 + 9 + 9 = 27.
Example: Forgot 6 × 4? Start from 5 × 4 = 20 and add one more 4: 20 + 4 = 24.
Watch out: When following a pattern, add the table number each time, not just 1.

Langkah 3

Semak sebelum menjawab

Teroka: cari dua ayat darab yang sama hasilnya, contohnya 3 × 6 = 2 × 9 = 18 dan 6 × 4 = 3 × 8 = 24.

3 × 6 = 2 × 9 = 18

Anggar dan semak = 估算与检查
写答案前先估一估大小是否合理。例如 7 × 8 一定比 7 × 5 = 35 大，又比 7 × 10 = 70 小。也可以看个位：5 的倍数，个位只会是 0 或 5。
例子：4 × 7 = 28，介于 4 × 5 = 20 和 4 × 10 = 40 之间，合理。
注意：答案超出估算范围时，要回头重算，不要直接交。

Anggar dan semak = Estimate and check
Before answering, check that the size makes sense. Rounding to 5 or 10 groups helps. For example, 7 × 8 must be more than 7 × 5 = 35 and less than 7 × 10 = 70.
Example: 4 × 7 = 28 lies between 4 × 5 = 20 and 4 × 10 = 40, so it is sensible.
Watch out: If an answer falls outside your estimate, work it out again instead of handing it in.

Semak cepat · Soalan 1 / 2

Cuba sendiri

Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.

6 × 8 = __

Darab 6 dan 8 = 6 乘 8
题目问 6 × 8，即 6 组、每组 8 个。如果不熟，可以从 5 × 8 = 40 开始，再加一组 8。也可以对调成 8 × 6，用另一种方法检查两个结果是否一样。
例子：6 × 3：先算 5 × 3 = 15，再加 3，得 18。
注意：从 5 组再往上加时只能加一组，加了两组就多算了。

Darab 6 dan 8 = Six times eight
The question asks for 6 × 8, which is six groups of eight. If you are unsure, start from 5 × 8 = 40 and add one more group of 8. Or swap to 8 × 6 and compare.
Example: 6 × 3: first 5 × 3 = 15, then add 3 to get 18.
Watch out: From five groups, add only one more group; adding two groups gives too much.

Semak cepat · Soalan 2 / 2

Cuba sendiri

Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.

3 × 9 = __

Darab 3 dan 9 = 3 乘 9
题目问 3 × 9，就是 3 组、每组 9 个，可以算 9 + 9 + 9。另一个办法是先算 3 × 10 = 30，再减去 3。两种方法答案相同，就可以放心。
例子：5 × 9 = 5 × 10 − 5 = 50 − 5 = 45。
注意：用“乘 10 再减”时，要减去的是组数 3，不是 9。

Darab 3 dan 9 = Three times nine
The question asks for 3 × 9, which is three groups of nine, so you can add 9 + 9 + 9. Another way is 3 × 10 = 30 and then take away 3. If both ways agree, you can be sure.
Example: 5 × 9 = 5 × 10 − 5 = 50 − 5 = 45.
Watch out: In the 'times 10, then subtract' trick, subtract the number of groups, not 9.

Ringkasan

Syabas!

Kamu telah belajar tentang Teroka Ria.

Ingat: baca soalan dengan lengkap; gunakan pola atau fakta songsang; semak sebelum menjawab.

Buat latihan tambahan →