Latihan
Latihan tambahan
4 soalan untuk mengukuhkan unit Maju Minda. Jika salah, baca petunjuk dan cuba lagi.
Pita 4.2 m dipotong kepada 5 bahagian sama panjang. Berapakah panjang setiap bahagian?
平均分 = bahagi sama
平均剪成几段,求一段多长,用除法。个位不够除时商写 0;除到最后还有余数,就在被除数后面补 0 继续除,直到除尽。
例子:3.6 m ÷ 5 → 3 不够除写 0,36 ÷ 5 = 7 余 1,10 ÷ 5 = 2 → 0.72 m。
注意:有余数时不要停,补 0 继续除;平均分用除法,不是乘法。
equal parts = bahagi sama
Cutting into equal pieces and finding one piece needs division. If the ones digit is too small, write 0 in the quotient; if there is still a remainder at the end, write a zero after the number and keep dividing until it is exact.
Example: 3.6 m ÷ 5: 3 is too small so write 0, 36 ÷ 5 = 7 r 1, 10 ÷ 5 = 2, giving 0.72 m.
Watch out: do not stop when there is a remainder, and equal sharing is division, not multiplication.
Botol A ada 212 ℓ air. Botol B ada 1310 ℓ air. Berapakah jumlah air?
带分数相加 = tambah nombor bercampur
“一共”用加法。整数加整数;分数部分先换成同一个分母(二和十的公分母是十)再加;最后把分数部分约到最简。
例子:1又1/2 + 1又1/10 = 2 + 5/10 + 1/10 = 2又6/10 = 2又3/5。
注意:分母不能相加;得到十分之几后要检查能不能约简。
adding mixed numbers = tambah nombor bercampur
'Altogether' means add. Add the whole numbers; change the fraction parts to the same denominator (10 works for halves and tenths) and add; then simplify the fraction part.
Example: 1 1/2 + 1 1/10 = 2 + 5/10 + 1/10 = 2 6/10 = 2 3/5.
Watch out: never add the denominators, and check whether the tenths can be simplified.
Kelas ada 60 orang murid. 34 daripadanya hadir. Berapakah murid yang tidak hadir?
求另一部分 = cari bahagian lain
题目给的是出席的分数,问的是缺席的人数。方法一:先求出席人数(总数 ÷ 分母 × 分子),再用总数减去。方法二:缺席占 1 减去出席的分数,再求这个分数 daripada 总数。
例子:40 人中 3/5 出席 → 出席 24 人,缺席 40 − 24 = 16 人。
注意:先看清楚题目问的是出席还是缺席。
find the other part = cari bahagian lain
The fraction given is for pupils present, but the question asks about pupils absent. Method 1: find those present (total ÷ denominator × numerator) and subtract from the total. Method 2: the absent fraction is 1 minus the present fraction; find that fraction of the total.
Example: 3/5 of 40 present means 24 present and 40 − 24 = 16 absent.
Watch out: read whether the question asks about present or absent pupils.
0.725 × 1 000 = ?
乘 1 000 = darab 1 000
乘 10、100、1 000,小数点往右移一、二、三位(看 0 的个数)。移完以后,如果最前面是 0,这个 0 可以不写;如果位数不够,就在后面补 0。
例子:0.46 × 1 000 = 460;2.1 × 100 = 210。
注意:乘 1 000 要移三位,移两位是乘 100,移四位就太多了。
multiplying by 1 000 = darab 1 000
Times 10, 100 or 1 000 moves the point one, two or three places right (count the zeros). After moving, a leading 0 can be dropped, and if there are not enough digits, write zeros at the end.
Example: 0.46 × 1 000 = 460; 2.1 × 100 = 210.
Watch out: × 1 000 moves three places; two places is × 100 and four is too many.
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