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Write a rule that describes the common multiples of 9 and 15 that are greater than 180?
Wiki User
∙ 14y ago
I have this exact same problem in my son's 6th grade math book. My answer is probably not how the teacher wants it since I cannot find an example in the book comparable to what I am doing but here is what I did...for now:
1st) Find the least common multiple of the two numbers 9 and 15
[3*3] and [3*5] so the LCM is 45 or [3*3]*[5] (in case you don't understand, find the number with the most threes, then the most fives and use them all, if you had more numbers then keep going with the grouping of the most whatevers)
2nd) Now since the rule asks for all multiples over 180 we simply say that they are:
45 * X where X is > 4 (because 4 * 45 = 180) and a whole number
I guess you could write it as: 180 + (X*45) and in this case X could be any whole number > 0.
My problem with the answer is that I don't believe my son is "solving" for X so early on in 6th grade. The "deer in the headlights" look gave me that clue.
PHOOD
Wiki User
∙ 14y ago
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What are all the common multiples of 49 and 14?
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manthan?
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