Tolak nombor pertama = Subtract the first number In a chain of subtractions, start with the first number and take away the second to get a running remainder. 800 − 125 = 675, so 675 is the running remainder. Example: For 500 take away 150 and then 120, first work out 500 − 150 = 350. Watch out: Take away only one number in this first step.
Langkah 2
Teruskan dengan baki
Gunakan baki sementara sebagai nombor baharu, kemudian tolak nombor seterusnya.
Teruskan dengan baki = Carry on from the remainder In the second step, the running remainder becomes the new starting number, and you take away the next number. 675 − 230 = 445. Example: After 500 − 150 = 350, work out 350 − 120 = 230. Watch out: Subtract from the remainder, not from the starting number 800.
Langkah 3
Catat setiap langkah
Tulis kedua-dua langkah dalam bentuk lazim: baki sementara ditulis di bawah, kemudian tolak nombor seterusnya.
Catat setiap langkah = Write down each step Write both steps: the first subtraction, the remainder, then the second subtraction. This shows every number was used and keeps the remainder from getting lost. Example: 900 − 250 = 650, then 650 − 315 = 335. Watch out: In your head it is easy to swap digits, like remembering 650 as 560.
Semak cepat · Soalan 1 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tolak berturut-turut = Subtract in a row The question is 800 − 125 − 230. Take away 125 first to get a running remainder, then take 230 from that remainder. Write both steps and check by adding. Example: For 700, 140 and 210: 700 − 140 = 560, then 560 − 210 = 350. Watch out: 800 has zeros in the tens and ones, so the first step needs regrouping from the hundreds.
Semak cepat · Soalan 2 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Semak cepat, tolak dua kali = Quick check, subtract twice The question is 675 − 120 − 205. First take 120 from 675 to get a running remainder, then take away 205. Line up the places in each step. Example: For 880, 230 and 140: 880 − 230 = 650, then 650 − 140 = 510. Watch out: 205 has 0 tens, so the tens column loses nothing in that step.
Ringkasan
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Ingat: tolak nombor pertama; teruskan dengan baki; catat setiap langkah.