# What is the divisibility test for 13

$Rule : For\; a\; given\; number\; N,\; to\; check\; whether\; it\; is\; divisible\; by\; 13\; or\; not,\; \\*\indent \indent \indent subtract\; the; last\; 2\; digits\; of\; the\; number\; N\; from\; the\; 4\; times\; (rest of the number).\\* Example : Let\; a\; number\; is\; 1001.\; Check\; whether\; it\; is\; divisible\; by\; 13\; or\; not.\\* Solution : By\; applying\; divisibility\; by\; 13\; rule,\; we\; get,\;\\* \Rightarrow 1001 : (10\times 4)-01=40-1=39\; and\; number\; 39\; is\; divisible\; by\; 13.\\* Hence,\; number\; 1001 \;is\; divisible \;by\; 13.$

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