Kumpul semula sa = Regroup the ones When the ones make 10 or more, trade 10 ones for 1 ten. 14 ones = 1 ten + 4 ones, so write 4 and carry 1. Example: 147 + 238: 7 + 8 = 15, write 5 and carry 1; 4 + 3 + 1 = 8; 1 + 2 = 3; the answer is 385. Watch out: Write the carried 1 above the tens so you do not forget it.
Langkah 2
Kumpul semula puluh
Apabila jumlah puluh ialah 10 atau lebih, tukarkan 10 puluh kepada 1 ratus.
Kumpul semula puluh = Regroup the tens When the tens make 10 or more, trade 10 tens for 1 hundred. 12 tens = 1 hundred + 2 tens, so write 2 and carry 1. Example: 261 + 172: 1 + 2 = 3; 6 + 7 = 13, write 3 and carry 1; 2 + 1 + 1 = 4; the answer is 433. Watch out: The carry from the tens is worth one hundred, not one ten.
Langkah 3
Kira dari kanan
Mulakan dengan sa, kemudian puluh dan akhirnya ratus. Cara lain: 384 + 199 = 383 + 200 = 583. Pada abakus, apabila lajur sa penuh, gunakan kawan besar 10.
Kira dari kanan = Work from the right Always start with the ones, then the tens, then the hundreds, writing down each carry. A carry from the right changes the column on its left. Example: 168 + 275: 8 + 5 = 13, carry 1; 6 + 7 + 1 = 14, carry 1; 1 + 2 + 1 = 4; the answer is 443. Watch out: Starting from the hundreds leaves no room to add the carries later.
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Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tambah 278 dan 145 = Add 278 and 145 The question is 278 + 145. The ones, 8 and 5, make more than 10, so carry once. The tens, plus that carry, also pass 10, so carry again. Example: 159 + 266 = 425. Watch out: Missing either carry makes the answer off by 10 or 100.
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Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tambah 356 dan 287 = Add 356 and 287 The question is 356 + 287. Add the ones and see whether they reach 10; then add the tens together with any carry; then the hundreds with any carry. Example: 267 + 189 = 456. Watch out: A forgotten carry into the tens is the usual slip in this sum.
Ringkasan
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Ingat: kumpul semula sa; kumpul semula puluh; kira dari kanan.