Unit 12
Banding Perpuluhan
Reben biru Mei Ling panjangnya 0.36 m. Reben kuning Hafiz panjangnya 0.5 m.
Reben siapakah lebih panjang?

比较小数 = banding perpuluhan
比较两个小数,就是看哪一个的数值比较大。0.36 有两位小数,0.5 只有一位,不能只看数字的个数或谁看起来“比较长”。可以用百格图、位值表或数线来比较。
例子:0.9 m 的绳子比 0.75 m 的长。
注意:小数点后数字比较多,不代表数值比较大。
comparing decimals = banding perpuluhan
Comparing two decimals means finding which one has the greater value. 0.36 has two decimal places and 0.5 has only one, so do not judge by how many digits there are. We can compare with hundred squares, a place value table or a number line.
Example: a 0.9 m rope is longer than a 0.75 m rope.
Watch out: more digits after the point does not mean a bigger value.
Cara 1 · Petak 100
Petak berwarna lebih banyak
0.36 dan 0.5
0.36
0.5
50 petak > 36 petak → 0.5 lebih besar daripada 0.36
用百格图比较 = banding dengan petak 100
把两个小数都涂在百格图上:0.36 涂 36 格,0.5 = 0.50 涂 50 格。哪一个涂的格子多,哪一个就比较大。所以 Hafiz 的丝带比较长。
例子:0.42 涂 42 格,0.3 涂 30 格 → 0.42 比较大。
注意:0.5 要涂 5 整行,不是 5 小格。
comparing on hundred squares = banding dengan petak 100
Colour both decimals on hundred squares: 0.36 is 36 squares and 0.5 = 0.50 is 50 squares. The one with more squares coloured is greater, so Hafiz's ribbon is longer.
Example: 0.42 is 42 squares and 0.3 is 30 squares → 0.42 is greater.
Watch out: 0.5 means 5 full rows, not 5 single squares.
Cara 2 · Nilai tempat
Banding dari kiri
Tempat sa, kemudian persepuluh
| sa | • | persepuluh | perseratus |
|---|---|---|---|
| 0 | • | 3 | 6 |
| 0 | • | 5 | 0 |
sa: 0 = 0
persepuluh: 5 > 3
0.5 lebih besar daripada 0.36
persepuluh: 5 > 3
0.5 lebih besar daripada 0.36
用位值比较 = banding nilai tempat
先把数字按位对齐,一位小数在后面补 0,变成 0.50。从最左边开始比:个位都是 0,一样;再比十分位,5 比 3 大,就可以决定了,不用再看百分位。
例子:0.62 和 0.8 → 十分位 6 < 8 → 0.8 比较大。
注意:十分位已经分出大小时,百分位再大也没有用。
comparing by place value = banding nilai tempat
Line the digits up by place, adding a 0 at the end of the one-place decimal to make 0.50. Start from the left: the ones are both 0, so they are equal; then the tenths: 5 is greater than 3, which decides it, so the hundredths do not matter.
Example: 0.62 and 0.8 → tenths 6 < 8 → 0.8 is greater.
Watch out: once the tenths differ, a big hundredths digit cannot change the result.
Cuba ini
Manakah lebih besar, 0.7 atau 0.65?
补 0 再比 = tambah sifar dahulu
两个小数位数不同时,先在一位小数后面补 0,让两个数都是两位小数,再从十分位开始比。也可以想成比较涂了几格。
例子:0.4 和 0.38 → 0.40 和 0.38 → 十分位 4 > 3 → 0.4 比较大。
注意:不要以为 65 比 7 大,就说两位的小数比较大。
add a zero first = tambah sifar dahulu
When two decimals have different numbers of places, add a 0 to the end of the one-place decimal so both have two places, then compare from the tenths. You can also think of how many squares each would colour.
Example: 0.4 and 0.38 → 0.40 and 0.38 → tenths 4 > 3 → 0.4 is greater.
Watch out: do not decide by thinking 65 is more than 7.
Cara 3 · Garis nombor
Kanan lebih besar, kiri lebih kecil
0.52 dan 0.56
0.50
0.51
0.52
0.53
0.54
0.55
0.56
0.57
0.58
← nilai semakin kecilnilai semakin besar →
0.52 terletak sebelum 0.56
0.52 lebih kecil daripada 0.56
数线 = garis nombor
数线上每一小格是 0.01。越往右,数值越大;越往左,数值越小。0.52 在 0.56 的左边(在它前面),所以 0.52 比较小,也可以说 0.56 比较大。
例子:0.19 在 0.23 的左边 → 0.19 比较小。
注意:数线上的刻度要一格一格数,不要跳着看。
number line = garis nombor
Each small step on this number line is 0.01. Moving right, the values get bigger; moving left, they get smaller. 0.52 is to the left of 0.56 (it comes before it), so 0.52 is smaller, or we can say 0.56 is greater.
Example: 0.19 lies to the left of 0.23 → 0.19 is smaller.
Watch out: count the marks one step at a time; do not skip any.
Cuba ini
Manakah lebih kecil, 0.5 atau 0.48?
0.44
0.45
0.46
0.47
0.48
0.49
0.50
0.51
0.52
← nilai semakin kecilnilai semakin besar →
找较小的数 = cari yang lebih kecil
题目问的是“比较小”。一位小数先在后面补 0,变成两位小数,才在数线上找得到它的刻度。比较靠左、先出现的那个就比较小。
例子:0.3 和 0.27 → 0.30 在 0.27 的右边 → 0.27 比较小。
注意:看清楚题目问大还是小,别选反了。
find the smaller one = cari yang lebih kecil
This question asks for the smaller value. Add a 0 to the end of a one-place decimal to make it a two-place decimal, then find its mark on the number line. The one further left, which comes first, is smaller.
Example: 0.3 and 0.27 → 0.30 lies to the right of 0.27 → 0.27 is smaller.
Watch out: read whether the question asks for bigger or smaller before you choose.
Terangkan
Mana lebih besar? Kenapa?
0.37 dan 0.7 · 0.68 dan 0.63
| sa | • | persepuluh | perseratus |
|---|---|---|---|
| 0 | • | 3 | 7 |
| 0 | • | 7 | 0 |
persepuluh: 7 > 3 → 0.7 > 0.37
| sa | • | persepuluh | perseratus |
|---|---|---|---|
| 0 | • | 6 | 8 |
| 0 | • | 6 | 3 |
persepuluh sama → perseratus: 8 > 3 → 0.68 > 0.63
说明理由 = terangkan
比较以后要说出原因:指出是哪一位决定了大小。0.37 和 0.7:先把 0.7 写成 0.70,十分位 7 比 3 大,所以 0.7 大。0.68 和 0.63:十分位都是 6,再比百分位,8 比 3 大,所以 0.68 大。
例子:0.9 > 0.89,因为十分位 9 > 8。
注意:符号 > 的开口朝向较大的数。
explain your answer = terangkan
After comparing, give the reason by naming the place that decides it. 0.37 and 0.7: write 0.7 as 0.70; the tenths 7 beats 3, so 0.7 is greater. 0.68 and 0.63: the tenths are both 6, so look at the hundredths; 8 beats 3, so 0.68 is greater.
Example: 0.9 > 0.89 because the tenths digit 9 > 8.
Watch out: the open side of the > sign faces the greater number.
Padankan
Pilih simbol yang betul
比较符号 = simbol banding
三个符号:> 表示左边比较大,< 表示左边比较小,= 表示一样大。先把每对数都补成两位小数,再从十分位比到百分位,最后选符号。
例子:0.45 ○ 0.5 → 0.45 和 0.50 → 十分位 4 < 5 → 选 <。
注意:符号是比较左边的数和右边的数,选之前先读清楚哪一个在左边。
comparison signs = simbol banding
There are three signs: > means the left number is greater, < means it is smaller, and = means they are equal. Make each pair two-place decimals, compare tenths then hundredths, and choose the sign.
Example: 0.45 ○ 0.5 → 0.45 and 0.50 → tenths 4 < 5 → choose <.
Watch out: the sign compares the left number with the right number, so check which one is on the left first.
Terangkan
Antara 0.1 dan 0.09, yang manakah lebih besar? Kenapa?
选出理由 = pilih sebab
理由要说出是哪一位决定了大小。先把位数补齐,再从十分位开始比:十分位不同,就由十分位决定,后面的百分位多大都没关系。
例子:0.2 和 0.19 → 0.20 和 0.19 → 十分位 2 > 1 → 0.2 比较大。
注意:只看哪个数字最大来判断,是常见的错误理由。
choose the reason = pilih sebab
A good reason names the place that decides the comparison. Give both numbers the same number of places, then start at the tenths: if the tenths differ, they decide it, however big the hundredths digit is.
Example: 0.2 and 0.19 → 0.20 and 0.19 → tenths 2 > 1 → 0.2 is greater.
Watch out: judging only by which single digit is biggest is a common wrong reason.
Ringkasan
Syabas!
0.5 > 0.36
Bandingkan perpuluhan dengan petak 100, nilai tempat (mula dari kiri) atau garis nombor (kanan lebih besar).
Latihan tambahan →