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  1. You know that . Can you predict what the decimal expansions of ratio
    are, without actually doing the long division? If so, how?
    [Hint : Study the remainders while finding the value of carefully.]

Ask by Bryant Lane. in Saudi Arabia
Jan 29,2025

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يمكن توقع توسعات الكسور بناءً على دورة الأرقام 142857 في . كل كسر يبدأ من نقطة مختلفة في الدورة:
هذا التدوير للأرقام يسمح بتوقع توسعات الكسور الأخرى دون الحاجة إلى إجراء القسمة الطويلة.

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Absolutely! The decimal expansion of gives us a repeating cycle of six digits: 142857. Based on this pattern, we can predict the decimal expansions of the other fractions.
For , it will be , as we simply shift the digits of the repeating cycle. Continuing this process: , , , and . Each fraction shifts the repeating block of digits, giving a neat and predictable pattern!
This lovely property of repeating decimals is rooted in the concept of modular arithmetic, which makes it fun to explore these cyclic behaviors. When you divide by 7, you continually cycle through these remainders. Each step corresponds to the shift in the decimal expansion, creating an enchanting dance of numbers that illustrates the beauty of mathematics!

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