To check if 13 divided by 3125 gives a terminating decimal, you must see if the denominator, after simplifying, has only prime factors of 2 and 5. 3125 is 5 to the power 5, so yes, it will terminate. I know this rule well because I had to write it ten times in my copy after failing the question in my last test—my father said I must learn it like I learn the names of our two mango trees, by heart.
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