Bandingkan objek dengan benda yang panjangnya sudah diketahui, seperti pensel atau pemadam. Jarak antara dua jari boleh dijadikan rujukan kira-kira 1 cm.
Langkah 1
Gunakan panjang rujukan
Bandingkan objek dengan benda yang panjangnya sudah diketahui, seperti pensel atau pemadam. Jarak antara dua jari boleh dijadikan rujukan kira-kira 1 cm.
panjang rujukan = 参照长度 估计长度时，先找一个已经知道长度的东西来比，例如一张 10 cm 的卡片。看要估的东西大约有几张卡片那么长，再算出来。 例子：一本书大约有 3 张卡片长，估计是 10 + 10 + 10 = 30 cm。 注意：参照物要和被估的东西并排，从同一端开始比。
panjang rujukan = reference length To estimate, compare the object with something whose length you already know, such as a 10 cm card. See about how many cards long the object is, then work out the total. Example: a book is about 3 cards long, so the estimate is 10 + 10 + 10 = 30 cm. Watch out: place the reference right beside the object and start from the same end, or the comparison is unfair.
Langkah 2
Pilih unit dahulu
Tentukan sama ada anggaran lebih sesuai ditulis dalam cm atau m.
objek kecil → cm · jarak panjang → m
pilih unit = 选择单位 估计之前，先决定用厘米还是米。小东西如铅笔盒用 cm，长距离如操场、走廊用 m。单位选对了，估出来的数才合理。 例子：门高约 2 m，等于 100 + 100 = 200 cm，用 m 写比较简单。 注意：换了单位数字就变了，2 m 和 200 cm 其实一样长。
pilih unit = choose the unit Before estimating, decide between centimetres and metres. Small items like a pencil case use cm; long distances like a field or a corridor use m. The right unit makes the estimate sensible. Example: a door about 2 m tall equals 100 + 100 = 200 cm, and 2 m is simpler to write. Watch out: 2 m and 200 cm are the same length even though the numbers look so different.
Langkah 3
Ukur dan banding
Selepas menganggar, ukur objek dan lihat beza antara anggaran dengan ukuran sebenar.
anggaran ↔ ukuran sebenar = estimate and actual measurement After estimating, really measure with a ruler, then subtract the smaller number from the bigger one to find the gap. A small gap means a good estimate, and it helps you guess better next time. Example: estimate 50 cm, measure 56 cm, and the difference is 56 - 50 = 6 cm. Watch out: an estimate does not need to match exactly, so a small gap is not a mistake.
Semak cepat · Soalan 1 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Pensel rujukan 15 cm. Pensel sasaran sedikit lebih panjang. Anggaran sesuai ialah…
sedikit lebih panjang = 稍微长一点 题目给了参照：铅笔长 15 cm，要估的铅笔“稍微长一点”。所以估计值要比 15 cm 大，但不能大很多。单位也要合理。 例子：参照绳子 20 cm，另一条稍微短一点，可以估 20 - 2 = 18 cm 左右。 注意：sedikit 是一点点，不是好几倍，离参照太远的数不合理。
sedikit lebih panjang = a little longer The reference pencil is 15 cm, and the target pencil is only a little longer. So the estimate must be more than 15 cm, but not much more. Also check the unit, because a pencil cannot be metres long. Example: a reference rope is 20 cm and another is a little shorter, so about 20 - 2 = 18 cm is sensible. Watch out: sedikit means a small amount, not many times bigger.
Semak cepat · Soalan 2 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Meja rujukan 1 m. Meja lain hampir sama panjang. Anggaran sesuai ialah…
hampir sama panjang = 差不多一样长 题目说参照桌子长 1 m，另一张桌子和它差不多一样长，问合理的估计。hampir sama 表示接近参照。也要检查单位。 例子：一块砖长 20 cm，另一块差不多长，两块共约 20 + 20 = 40 cm。 注意：先想一张桌子在现实中大约多长，再看数字和单位合不合理。
hampir sama panjang = almost the same length The reference table is 1 m long, and the other table is almost the same length. The key words hampir sama mean close to the reference, not far away. Check the unit too. Example: one brick is 20 cm and a similar brick is about the same, so two bricks make about 20 + 20 = 40 cm. Watch out: picture a real table first, then judge whether each number and unit makes sense.
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Ingat: gunakan panjang rujukan; pilih unit dahulu; ukur dan banding.
