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= ﻿ ﻿ My favorite number is 15 because on the 15th of August was the day. I was born on. 15 is a composite number because 1,3 & 5 are factor's of the number 15 ;) You can do your math the addition way 3+3+3+3+3=15 or 5+5+5=15 Still this way is sort of long but still 3rd grader's & higher should be multiplying all ready . The earlier, the better. Here in Grant Becan Middle School we practice for college . =