Kumpul semula satu puluh = Regroup one ten If there are not enough ones to subtract, take 1 ten and change it into 10 ones. Example: 352 − 127: 2 ones is too few, so regroup to get 12 − 7 = 5; the tens drop to 4, and 4 − 2 = 2; then 3 − 1 = 2, giving 225. Watch out: After regrouping, the tens digit goes down by 1.
Langkah 2
Kumpul semula satu ratus
Jika puluh tidak mencukupi, tukarkan 1 ratus kepada 10 puluh.
Kumpul semula satu ratus = Regroup one hundred If there are not enough tens, take 1 hundred and change it into 10 tens. Example: 528 − 263: 8 − 3 = 5; 2 tens is too few, so regroup to get 12 − 6 = 6; the hundreds drop to 4, and 4 − 2 = 2, giving 265. Watch out: A regrouped hundred adds 10 to the tens, not just 1.
Langkah 3
Berhati-hati dengan sifar
Jika nilai tempat bernilai sifar, kumpul semula dari kiri secara berturutan. Cara lain: 500 − 98 = 500 − 100 + 2 = 402. Untuk mencari anu: 932 − ☐ = 578, kira 932 − 578; ☐ − 406 = 531, kira 531 + 406.
Berhati-hati dengan sifar = Be careful with zero If the tens digit is 0, first regroup a hundred into the tens, then a ten into the ones. Example: 403 − 156: the hundreds become 3 and the tens become 10; then the tens become 9 and 13 − 6 = 7; 9 − 5 = 4; 3 − 1 = 2, giving 247. Watch out: After passing one ten on, the tens digit is 9, not 10 or 0.
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Tolak 178 daripada 432 = Take 178 from 432 The question is 432 − 178. The ones, 2, are too few to take 8, so regroup. After that the tens are too few to take 7, so regroup again. Example: 521 − 186 = 335. Watch out: Each regroup lowers the digit on the left by 1, and here that happens twice.
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Tolak 246 daripada 701 = Take 246 from 701 The question is 701 − 246. The tens digit of 701 is 0, so the ones cannot borrow from it directly; regroup from the hundreds first. Check by adding: your answer plus 246 must make 701. Example: 602 − 175 = 427. Watch out: Do not flip 1 − 6 into 6 − 1; the top digit always comes first.
Ringkasan
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Ingat: kumpul semula satu puluh; kumpul semula satu ratus; berhati-hati dengan sifar.