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5 soalan untuk mengukuhkan unit Darab Perpuluhan. Jika salah, baca petunjuk dan cuba lagi.
7 × 3.8 = ?
一位小数 = satu tempat perpuluhan
把小数当作整数来乘,乘完以后,原来有几位小数,积就有几位小数。再用估算检查:把一位小数凑成最接近的整数去乘,答案应该在附近。
例子:6 × 4.7 → 47 × 6 = 282 → 一位小数 → 28.2;估算 6 × 5 = 30,接近。
注意:进位要加对;乘完不点小数点,答案会大十倍。
one decimal place = satu tempat perpuluhan
Multiply as if the decimal were a whole number; the product has as many decimal places as the decimal had. Check by rounding the decimal to the nearest whole number; the answer should be close.
Example: 6 × 4.7: 47 × 6 = 282, one decimal place gives 28.2; estimate 6 × 5 = 30.
Watch out: carry correctly, and without the point the product comes out ten times too big.
9 × 0.24 = ?
两位小数 = dua tempat perpuluhan
零点几几乘整数:先当作整数乘,再数小数位数——零点几几有两位小数,积也从右边数两位点小数点。也可以用估算检查答案大小是否合理(例如 7 × 0.35 约为 7 × 0.3 = 2.1)。
例子:7 × 0.35 → 35 × 7 = 245 → 两位小数 → 2.45。
注意:小数位数要和原来的一样多,不能多也不能少。
two decimal places = dua tempat perpuluhan
For a two-place decimal times a whole number, multiply as whole numbers and then count two places from the right. You can also check with an estimate (for example, 7 × 0.35 is about 7 × 0.3 = 2.1).
Example: 7 × 0.35: 35 × 7 = 245, two decimal places gives 2.45.
Watch out: the product must have the same number of decimal places, not more and not fewer.
1 000 × 5.09 = ?
乘一千 = darab seribu
乘一千,小数点往右移三位。如果原来的小数位数不够三位,移到数字的尽头以后,还要在后面补 0,直到移够三位为止。
例子:1 000 × 0.7 = 700;1 000 × 2.36 = 2 360。
注意:小数中间的 0 要保留;位数不够时要补 0,不能少移。
times one thousand = darab seribu
Times 1 000 moves the point three places right. If the decimal has fewer than three decimal places, keep moving past the last digit by writing zeros until you have moved three places.
Example: 1 000 × 0.7 = 700; 1 000 × 2.36 = 2 360.
Watch out: keep any zero in the middle, and fill with zeros so you do not move too few places.
Sebatang reben panjangnya 3.125 m. Berapakah panjang 5 batang reben yang sama?
三位小数 = tiga tempat perpuluhan
几条一样长的丝带,总长用乘法。三位小数乘整数:当作整数乘,积从右边数三位点小数点。乘的时候每一位都可能进位,要一位一位写清楚。
例子:4 × 2.125 → 2 125 × 4 = 8 500 → 三位小数 → 8.500 = 8.5 米。
注意:一条的长度加整数不是总长;每一位的进位都要加上去。
three decimal places = tiga tempat perpuluhan
The total length of several equal ribbons is found by multiplying. For a three-place decimal times a whole number, multiply as whole numbers and count three places from the right. Every place may carry, so write each step clearly.
Example: 4 × 2.125: 2125 × 4 = 8500, three decimal places gives 8.500 = 8.5 m.
Watch out: adding the whole number to one length is not the total, and add every carried digit.
8 × 1.25 = ?
积可能是整数 = hasil darab nombor bulat
照样当作整数乘,再按原来的小数位数点小数点。如果点完以后小数部分全是 0,这些 0 可以去掉,积就是一个整数。估算可以帮你检查:一又四分之一乘八大约多少?
例子:4 × 0.75 → 75 × 4 = 300 → 3.00 → 3。
注意:点小数点时要从积的最右边数,包括末尾的 0。
the product may be whole = hasil darab nombor bulat
Multiply as whole numbers and place the point by the number of decimal places as usual. If the decimal part is all zeros, drop them and the product is a whole number. Estimating helps: about how much is eight lots of one and a quarter?
Example: 4 × 0.75: 75 × 4 = 300, which is 3.00, so 3.
Watch out: count from the right of the product, including the zeros at the end.
Tahniah! Kamu telah menyelesaikan latihan.
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