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Modul Abakus

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ABAKUS DAN ARITMETIK MENTALContoh 4:Pengiraan <strong>Abakus</strong> 423 – 291 =1.2.Mula , naik 423Tolak 291, turun 2 pada tiangratus. Turun 9 pada tiang puluh.Tetapi manik tidak mencukupi.Fikir!Kawan Besar bagi 9ialah 1.3.109 1Ambil 1 padatiang ratus4.5.6.Naik 1 pada tiangpuluhTurun 1 padatiang saJawapan 132TOLAK: KOMBINASI 10 22

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