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You would say to yourself:

-- If it has to be divisible by 5 and 9, then it's divisible by 45.

-- The biggest 3-digit number is 999.

-- 999 divided by 45 is 22.2

-- So if I multiply 45 by only 22 and leave off the 0.2,

I'll get the biggest one that's less than 999.

-- 45 x 22 = 990 .

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Q: How would you find the greatest 3 digit number divisibleby 5 and 9?
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