Latihan
Latihan tambahan
5 soalan untuk mengukuhkan unit Tambah dan Tolak Pecahan. Jika salah, baca petunjuk dan cuba lagi.
512 + 1112 − 712 = ?
从左到右再约简 = kiri ke kanan, kemudian permudahkan
分母相同,只算分子:先加后减。中间得到假分数没关系,继续减就好。最后看结果比 1 大还是比 1 小,再约简到最简形式。
例子:1/10 + 7/10 − 3/10 = 8/10 − 3/10 = 5/10 = 1/2。
注意:结果比 1 小时不能写成带分数;只有分子大于分母时才有整数部分。
left to right, then simplify = kiri ke kanan, kemudian permudahkan
The denominators match, so work only with the numerators: add, then subtract. An improper fraction in the middle is fine; just carry on. At the end, see whether the result is more or less than 1 and simplify it.
Example: 1/10 + 7/10 − 3/10 = 8/10 − 3/10 = 5/10 = 1/2.
Watch out: a result less than 1 has no whole number part.
4310 − 2 + 110 = ?
带分数减整数 = nombor bercampur tolak nombor bulat
按从左到右的次序:带分数减整数时,只有整数部分改变,分数部分不变;然后把分数加上去;最后把分数部分约简。
例子:3又1/4 − 1 + 1/4 = 2又1/4 + 1/4 = 2又2/4 = 2又1/2。
注意:看清楚每个符号,减号不能当成加号;答案记得约简。
a mixed number minus a whole number = nombor bercampur tolak nombor bulat
Work from left to right. Taking a whole number from a mixed number changes only the whole number part; then add the fraction and simplify the fraction part.
Example: 3 1/4 − 1 + 1/4 = 2 1/4 + 1/4 = 2 2/4 = 2 1/2.
Watch out: read every sign carefully; a minus sign is not a plus sign.
34 − 12 + 18 = ?
换成八分之几 = tukar kepada perlapan
三个分母是四、二、八,八是它们的公倍数,所以都换成八分之几。然后分子按次序先减后加。
例子:5/6 − 1/2 + 1/3 = 5/6 − 3/6 + 2/6 = 4/6 = 2/3。
注意:最后一个是加号,做完减法还要把它加上去,不要把它也减掉。
change to eighths = tukar kepada perlapan
The denominators are 4, 2 and 8, and 8 is a multiple of all of them, so change everything into eighths. Then subtract and add the numerators in order.
Example: 5/6 − 1/2 + 1/3 = 5/6 − 3/6 + 2/6 = 4/6 = 2/3.
Watch out: the last sign is plus, so add that fraction; do not take it away as well.
Tali 6 m. 215 m dipotong, kemudian 310 m disambung. Berapakah panjang tali sekarang?
应用题 = masalah
先把文字变成算式:剪掉是减,接上是加,顺序跟故事一样。然后从整数借 1 做减法,再把分母统一成十分之几做加法;分数部分满 1 要进位,最后写上单位米。
例子:7 − 2又1/4 + 3/4 = 4又3/4 + 3/4 = 5又2/4 = 5又1/2。
注意:剪掉的长度要减,不能也当成加进去。
a word problem = masalah
Turn the story into a number sentence first: cutting off is minus and joining on is plus, in the order of the story. Borrow 1 to subtract, change to tenths to add, carry if the fraction reaches 1, and write the unit m.
Example: 7 − 2 1/4 + 3/4 = 4 3/4 + 3/4 = 5 2/4 = 5 1/2.
Watch out: the piece cut off must be subtracted, not added.
23 + 12 − 56 = ?
六分之几 = perenam
三、二、六的最小公分母是六,把三个分数都换成六分之几,分子按次序先加后减,最后约简。
例子:3/4 + 1/8 − 1/2 = 6/8 + 1/8 − 4/8 = 3/8。
注意:得到六分之几以后,要看分子和分母能不能同时除以二或三。
sixths = perenam
The smallest common denominator of 3, 2 and 6 is 6, so change all three fractions to sixths, add then subtract the numerators, and simplify.
Example: 3/4 + 1/8 − 1/2 = 6/8 + 1/8 − 4/8 = 3/8.
Watch out: once you have sixths, check whether the top and bottom can both be divided by 2 or 3.
Tahniah! Kamu telah menyelesaikan latihan.
Kembali ke Pecahan, Perpuluhan dan Peratus