සංඛ්යා ලිවීමේ දී, අප බහුල ව භාවිත කරන්නේ හින්දු අරාබි සංඛ්යා ක්රමය යි.
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එම ක්රමය අනුව සංඛ්යා ලිවීමේ දී 0, 1, 2, 3, 4, 5, 6, 7, 8 හා 9 යන ඉලක්කම් දහය භාවිත කරනු ලැබේ.
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බින්දුවේ සිට නවය තෙක් ඇති සංඛ්යාවක් ලිවීමේ දී, අප එක් ඉලක්කමක් එක් ස්ථානයක ලියයි.
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උදාහරණයක් ලෙස, තුන යන සංඛ්යාව ඉලක්කම් භාවිත කර ලියනු ලබන්නේ 3 ලෙස ය.
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එනම්, 3 ලිවීමට එක් ස්ථානයක් භාවිත කරනු ලැබේ.
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එක් ස්ථානයක් පමණක් යොදා ගෙන ලිවිය හැකි විශාලතම සංඛ්යාව 9 වේ.
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නවයට වඩා එකකින් විශාල සංඛ්යාව දහය වේ.
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දහයේ සිට අනූ නවය තෙක් ඇති සංඛ්යාවක් ලියන්නේ, ඉලක්කම් දෙකක් හෝ එක ම ඉලක්කම දෙවතාවක් හෝ ස්ථාන දෙකක් යොදා ගෙන ලිවීමෙනි.
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උදාහරණයක් ලෙස, දහය යන සංඛ්යාව, ඉලක්කම් භාවිත කර ලියනු ලබන්නේ 10 ලෙස ය.
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අනූ නවය යන සංඛ්යාව, ඉලක්කම් භාවිත කර ලියනු ලබන්නේ 99 ලෙස ය.
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එනම්, 10 සහ 99 ලිවීමට ස්ථාන දෙක බැගින් භාවිත කරනු ලැබේ.
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දැන් අපි 3 හා 5 යන ඉලක්කම් දෙක, ස්ථාන දෙකක යොදමින් ලියන සංඛ්යා කිහිපයක් විමසා බලමු.
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3 හා 5 යන ඉලක්කම් දෙක 35 ලෙස ලියූ විට සංඛ්යාව “තිස් පහ” වේ.
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3 හා 5 යන ඉලක්කම් දෙක 53 ලෙස ලියූ විට සංඛ්යාව “පනස් තුන” වේ.
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එනම් 3 හා 5 යන එක් එක් ඉලක්කම පිහිටන ස්ථානය අනුව ලැබෙන සංඛ්යා එකිනෙකට වෙනස් වේ.
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දැන් අපි සංඛ්යාවක, එක් එක් ඉලක්කම පිහිටන ස්ථානයට අදාළ ස්ථානීය අගයත්, එක් එක් ඉලක්කමෙන් නිරූපිත අගයත් පැහැදිලි කර ගනිමු.
● පබළු තිස් පහක් ගෙන දහය බැගින් වැල්වලට ඇමුණූ විට දහයේ පබළු වැල් 3ක් ලැබෙන අතර, පබළු 5ක් ඉතිරි වේ.
දහයේ ඒවා 3 යි.
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එකේ ඒවා 5 යි.
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පබළු තිස් පහ, දහයේ ඒවා තුනකටත්, එකේ ඒවා පහකටත් වෙන් කළ හැකි ය.
එනම්,
තිස් පහ = දහයේ ඒවා 3 + එකේ ඒවා 5 = 35
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ඉහත පැහැදිලි කිරීමට අනුව, තිස්පහෙහි එකේ ඒවා 5 නිරූපණය කිරීමට, 5 ඉලක්කම ලියන ස්ථානයෙහි ස්ථානීය අගය 1 ලෙස ගෙන ඇත.
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එම ස්ථානය එකස්ථානය ලෙස නම් කරනු ලැබේ.
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තිස් පහෙහි, දහයේ ඒවා 3 නිරූපණය කිරීමට එකස්ථානයට වම් පසින් වූ ස්ථානයෙහි ස්ථානීය අගය 10 ලෙස ගෙන, 3 ඉලක්කම එම ස්ථානයෙහි ලියා ඇත.
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එම ස්ථානය දසස්ථානය ලෙස නම් කරනු ලැබේ.
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එක් එක් ස්ථානය හතරැස් කොටුවකින් සලකුණු කොට, 35හි එක් එක් ඉලක්කමේ පිහිටීම පහත රූපයේ දක්වා ඇත.
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