Baki atau beza = What is left or the difference Subtraction finds what is left after some are taken away, or how far apart two amounts are. Starting amount − amount taken = what is left. Example: There are 365 stickers and 120 are given away, so 365 − 120 = 245 are left. Watch out: Start with the bigger number; do not swap the two numbers.
Langkah 2
Susun mengikut nilai tempat
Tulis sa di bawah sa, puluh di bawah puluh dan ratus di bawah ratus sebelum menolak.
Susun sebelum menolak = Line up before subtracting In column subtraction, put ones under ones, tens under tens and hundreds under hundreds. Then subtract from the ones, so each column deals with one kind of place. Example: 587 − 45: line 45 up on the right; 7 − 5 = 2, 8 − 4 = 4, and the 5 hundreds stay, giving 542. Watch out: When the bottom number has no hundreds, copy the top hundreds digit straight down.
Langkah 3
Semak dengan tambah
Tambah baki kepada nombor yang ditolak untuk menyemak. Untuk mencari nombor yang hilang, contohnya 789 − ☐ = 453, kira 789 − 453 = 336.
Semak dengan tambah = Check by adding After subtracting, add the answer back to the number you took away. You should get the starting number again. Example: 648 − 215 = 433. Check: 433 + 215 = 648, so it is right. Watch out: Add the answer to the number taken away, not to the starting number.
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Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tolak 243 daripada 786 = Take 243 from 786 The question is 786 − 243. Each top digit is bigger than the one below, so no borrowing is needed; subtract ones, tens and hundreds in turn. Then add 243 back to check. Example: 958 − 314 = 644. Watch out: Take extra care with the tens column, where the choices differ.
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Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tolak 321 daripada 654 = Take 321 from 654 The question is 654 − 321. Subtract each place in turn; no borrowing is needed. Check with addition: your answer plus 321 must equal 654. Example: 879 − 456 = 423, and 423 + 456 = 879. Watch out: Always take the bottom digit from the top digit, never the other way round.
Ringkasan
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Ingat: cari baki atau beza; susun mengikut nilai tempat; semak dengan tambah.