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Quick Multiplication of any two numbers whose last two digits add upon 10 and all other numbers are the same :-

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This is a sub-corollary named "Antyayor-dasake" to the sutra "Urdhva Tiryagbhyaam" which implies that the rule is applicable not only to the squaring of a number ending ending in 5, but also to the multiplication of two numbers whose last digit together total 10 and whose previous part is exactly the same.

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