Tambah dua dahulu = Add two first With three numbers, add two of them first to get a running total, then add the third. 125 + 200 = 325, then 325 + 74 = 399. Example: For 210, 130 and 45: first 210 + 130 = 340, then 340 + 45 = 385. Watch out: Write the running total down instead of holding it in your head.
Langkah 2
Cari pasangan mesra
Pilih dua nombor yang mudah membentuk puluh atau ratus penuh. Dalam bentuk lazim, susun ketiga-tiga nombor mengikut nilai tempat. Contoh: 128 + 238 + 103: sa 8 + 8 + 3 = 19, tulis 9 dan kumpul semula 1 puluh.
Pasangan mesra = Friendly pairs Look for two numbers that make a whole ten or hundred, and add them first. 175 + 25 = 200, because the ones 5 + 5 = 10. Example: For 63, 180 and 37: first 63 + 37 = 100, then 100 + 180 = 280. Watch out: Check whether the ones digits make 10, like 5 with 5 or 3 with 7.
Langkah 3
Semak semua penambah
Pastikan ketiga-tiga nombor telah digunakan sekali sahaja.
Semak semua penambah = Check every addend All three numbers must be used, and each only once. After adding, tick each number to be sure none is missing or counted twice. Example: 150 + 26 + 200 = 376, with all three numbers ticked. Watch out: After adding a friendly pair, it is easy to forget the third number.
Semak cepat · Soalan 1 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Tambah tiga nombor = Add three numbers The question is 125 + 214 + 130. Add two numbers first, then the third; no carrying is needed here. Finally check that all three numbers were used. Example: 111 + 203 + 140 = 454. Watch out: The ones column has three digits to add, 5, 4 and 0, not two.
Semak cepat · Soalan 2 / 2
Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
240 + 135 + 122 = __
Jumlah tiga nombor = 三个数的和 这题算 240 + 135 + 122。先加两个数得到暂时的和,写下来,再加第三个数。每一列的数字都要算进去。 例子:320 + 114 + 153 = 587。 注意:暂时的和写错一位,最后答案也会跟着错,要先检查它。
Jumlah tiga nombor = Total of three numbers The question is 240 + 135 + 122. Add two numbers first, write down the running total, then add the third. Every digit in each column must be counted. Example: 320 + 114 + 153 = 587. Watch out: A mistake in the running total carries into the final answer, so check it first.
Ringkasan
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Ingat: tambah dua dahulu; cari pasangan mesra; semak semua penambah.