Latihan
Latihan tambahan
5 soalan untuk mengukuhkan unit Jana Minda. Jika salah, baca petunjuk dan cuba lagi.
Sebuah kilang menghasilkan 12 480 botol kicap pada hari Isnin. Pada hari Selasa, kilang itu menghasilkan 2 kali ganda bilangan itu, tetapi 315 botol didapati rosak. Berapakah botol kicap yang elok pada hari Selasa?
多步应用题 = masalah beberapa langkah
第一步:“两倍”用乘法,先求星期二一共做了多少瓶。第二步:其中有些是坏的,要用减法把坏的减掉,剩下的才是好的。每一步都写出算式。
例子:星期一 1 000 个,星期二是两倍但坏了 50 个 → 2 × 1 000 − 50 = 1 950 个好的。
注意:坏的数量是从星期二的总数里减,不是从星期一的数里减。
a multi-step problem = masalah beberapa langkah
Step 1: twice as many means multiply, so find how many bottles were made on Tuesday. Step 2: some were damaged, so subtract them; what is left is the good bottles. Write a number sentence for each step.
Example: Monday 1 000, Tuesday twice as many but 50 damaged: 2 × 1 000 − 50 = 1 950 good ones.
Watch out: the damaged bottles are taken from Tuesday's total, not from Monday's.
Kedai buku membeli 1 850 kotak pensel. Setiap kotak ada 12 batang pensel. Semua pensel diikat semula, 30 batang seikat. Berapakah ikatan pensel yang diperoleh?
先乘后除 = darab kemudian bahagi
第一步用乘法求铅笔的总数:盒数乘每盒的支数。第二步用除法,看总数里有几个三十:除以三十可以先除以十,再除以三。
例子:50 盒,每盒 6 支,每 20 支一扎 → 50 × 6 = 300,300 ÷ 20 = 15 扎。
注意:除以三十时,除以十和除以三两步都要做。
multiply then divide = darab kemudian bahagi
Step 1: multiply to find the total number of pencils: boxes × pencils in a box. Step 2: divide to see how many 30s are in the total; ÷ 30 can be done as ÷ 10 then ÷ 3.
Example: 50 boxes of 6 pencils, tied in bundles of 20: 50 × 6 = 300 and 300 ÷ 20 = 15 bundles.
Watch out: when dividing by 30, do both the ÷ 10 and the ÷ 3.
Sebotol jus mengandungi 1.25 ℓ. Encik Ali membeli 6 botol dan menuang semua jus itu sama banyak ke dalam 4 buah jag. Berapakah isi padu jus dalam sebuah jag?
小数的乘和除 = darab dan bahagi perpuluhan
第一步用乘法求果汁的总量:每瓶的容量乘瓶数,小数点要点对。第二步把总量平均倒进几个壶里,用除法。除不尽的时候,在后面补零继续除。
例子:每瓶 0.5 ℓ,买 3 瓶,平均倒进 2 个壶 → 1.5 ℓ ÷ 2 = 0.75 ℓ。
注意:总量不是答案,题目问的是一个壶里有多少。
multiplying and dividing decimals = darab dan bahagi perpuluhan
Step 1: multiply to find the total juice: the volume of one bottle × the number of bottles, placing the point correctly. Step 2: pour the total equally into the jugs, which is division; if it does not divide exactly, add zeros and keep dividing.
Example: 0.5 ℓ bottles, 3 bought, shared into 2 jugs: 1.5 ℓ ÷ 2 = 0.75 ℓ.
Watch out: the total is not the answer; the question asks how much is in one jug.
Pak Ali menuai 238 kg cili pada waktu pagi dan 134 kg pada waktu petang. Berapakah jumlah cili yang dituai?
带分数相加 = tambah nombor bercampur
先把分母统一,四分之几化成八分之几。整数和整数相加,分数和分数相加。如果分数部分加起来变成假分数(分子比分母大),要化出一个整数,进到整数部分。
例子:1又5/6 + 2又1/3 = 1又5/6 + 2又2/6 = 3又7/6 = 4又1/6。
注意:分数部分满一个整数时要进位,不然答案会少一。
adding mixed numbers = tambah nombor bercampur
First make the denominators the same by changing the quarters into eighths. Add the whole numbers and add the fractions. If the fraction part becomes improper (numerator bigger than denominator), take out a whole one and add it to the whole numbers.
Example: 1 5/6 + 2 1/3 = 1 5/6 + 2 2/6 = 3 7/6 = 4 1/6.
Watch out: when the fractions make a whole one, carry it, or the total comes out 1 short.
Nadia mahu membeli kasut sukan berharga RM138 dalam masa 6 minggu. Dia sudah ada RM30 dan akan menyimpan RM2.50 setiap hari. Cukupkah wang Nadia pada akhir minggu keenam?
理财计划 = rancangan kewangan
这是一个储蓄计划题。第一步:几个星期有多少天(一星期七天)。第二步:每天存的钱乘天数,求出这段时间存到的钱。第三步:加上原来已经有的钱。最后和目标价钱比较,够了就算达成,不够就算出还差多少。
例子:4 星期、每天存 RM1.50、原有 RM20 → 28 × RM1.50 + RM20 = RM62,想买 RM58 的东西 → 够,多 RM4。
注意:一星期是七天,不是五天;原来已经有的钱不能忘记加。
a money plan = rancangan kewangan
This is a savings plan. Step 1: find how many days are in the weeks (7 days a week). Step 2: multiply the daily saving by the number of days. Step 3: add the money already saved. Finally compare with the price: if it is enough the goal is reached; if not, work out how much is missing.
Example: 4 weeks, RM1.50 a day, RM20 already: 28 × RM1.50 + RM20 = RM62, for a RM58 item: enough, RM4 over.
Watch out: a week has 7 days, not 5, and do not forget the money already saved.
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