Tukar susunan = Change the order In addition, the order can change without changing the total. 120, 80 and 300 make 500 in any order. Example: 45 + 210 + 55 = 310, and 210 + 45 + 55 = 310 too. Watch out: Changing the order only works for adding; in subtraction it changes the answer.
Langkah 2
Gabung pasangan mudah
Cari pasangan yang membentuk jumlah mudah seperti 100, 200 atau 500.
Gabung pasangan mudah = Join an easy pair Look for a pair that makes 100, 200 or 500 and add it first. 135 + 65 = 200, because 5 + 5 = 10 ones and 3 + 6 + 1 = 10 tens. Example: For 240, 160 and 75: first 240 + 160 = 400, then 400 + 75 = 475. Watch out: When making a whole number, remember the 1 carried from the ones.
Langkah 3
Buktikan jumlah sama
Kira dengan dua susunan berlainan dan bandingkan jawapannya.
Buktikan jumlah sama = Prove the totals match Work the sum in two different orders and compare. If both ways give the same total, the order did not matter, and you have also checked your work. Example: Way A: 90 + 110 = 200, then 200 + 35 = 235. Way B: 35 + 90 = 125, then 125 + 110 = 235. Watch out: If the two ways disagree, one of them has a mistake to find.
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Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Pasangan manakah paling mudah ditambah dahulu bagi 128 + 72 + 300?
Pasangan paling mudah = Easiest pair The question gives 128, 72 and 300 and asks which two are easiest to add first. Look for a pair whose ones digits make 10 so the pair becomes a whole hundred. Example: In 46, 300 and 54, the ones 6 + 4 = 10, so 46 + 54 = 100. Watch out: The easiest pair is the one that makes a whole number, not the one with the smallest numbers.
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Cuba sendiri
Pilih jawapan. Jika belum tepat, baca petunjuk dan cuba lagi.
Jumlah = Total The question is 245 + 155 + 100. Look for a friendly pair: 245 and 155 have ones that make 10, so together they make a whole hundred; then add 100. Example: For 325, 75 and 200: 325 + 75 = 400, then 400 + 200 = 600. Watch out: Include the carried ten when you add 245 and 155.
Ringkasan
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Ingat: tukar susunan; gabung pasangan mudah; buktikan jumlah sama.