Oh, dude, that's easy! What goes into 13 and 12 equally? Well, technically, the number 1 goes into both 13 and 12 equally because they're both divisible by 1. But like, who really cares about that, right? Math can be such a buzzkill sometimes.
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2 and 12
13 can only be dived equally by 1 and 13
No integer other than 1 does. Numbers like this are said to be co-prime.
The answer to 156 divided by 13 is 12.
13x9= 117 13 is prime so you don't continue with 13 because nothing goes into it equally. Then you continue with 9, and obviously 3 goes into 9 three times. (3x3=9) Now, since nothing goes evenly into three, we stop our factor tree. (: