Gabung dua kuantiti = Join two amounts Adding joins two amounts together. For 231 + 146, the ones give 1 + 6 = 7, the tens give 3 + 4 = 7 and the hundreds give 2 + 1 = 3, so the total is 377. Example: 152 + 325 = 477. Watch out: A sum is always bigger than each number added; a smaller answer means a mistake.
Langkah 2
Susun mengikut nilai tempat
Tulis sa di bawah sa, puluh di bawah puluh dan ratus di bawah ratus. Kita juga boleh membilang terus pada garis nombor. Pada abakus, jika manik bawah tidak cukup, gunakan kawan kecil: untuk tambah 2, naikkan 5 dan turunkan 3.
Susun mengikut nilai tempat = 按数位对齐来加 直式加法要个位对个位、十位对十位、百位对百位,再从个位开始加。对齐了,每一列加的才是同一种数位。 例子:402 + 35,35 的 5 要对齐 402 的 2,得 402 + 35 = 437。 注意:两位数要靠右对齐,别把 35 的 3 放在百位下面。
Susun mengikut nilai tempat = Line up places to add In column addition, put ones under ones, tens under tens and hundreds under hundreds, then add from the ones. Each column then adds the same kind of place. Example: For 402 + 35, line the 5 up under the 2, giving 402 + 35 = 437. Watch out: Line a two-digit number up on the right, not under the hundreds.
Langkah 3
Semak dengan anggaran
Anggar jumlah dahulu. Jika 320 + 170, jawapan patut hampir 500.
Semak dengan anggaran = Check with an estimate Estimate the total first. For 320 + 170, think about 300 + 200 = 500, so the real answer should be close to 500. Example: 410 + 290 = 700, and the estimate 400 + 300 = 700 agrees, so the answer makes sense. Watch out: If your answer is far from the estimate, go back and check your columns.
Semak cepat · Soalan 1 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tambah 243 dan 125 = Add 243 and 125 The question is 243 + 125. Add the ones, tens and hundreds in columns; no regrouping is needed here. Then check with an estimate of about 240 plus 130. Example: 314 + 152 = 466. Watch out: The choices differ only in the tens digit, so add that column carefully.
Semak cepat · Soalan 2 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tambah 410 dan 238 = Add 410 and 238 The question is 410 + 238. Line the numbers up by place value and add from the ones. Adding 0 to a digit leaves it unchanged. Example: 520 + 167 = 687. Watch out: 410 has 0 ones, so do not add anything extra into the ones column.
Ringkasan
Syabas!
Kamu telah belajar tentang Tambah Dua Nombor.
Ingat: gabung dua kuantiti; susun mengikut nilai tempat; semak dengan anggaran.