Frank must choose a number between 67 and 113 that is a multiple of 3,4 and 9 . Write all the numbers that he could choose.
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See attached. The trick is to use similar triangles.
I have memorized facts about fractions like these, so can tell you ...
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A fraction with 9 as a denominator is a repeating 1-digit decimal with the decimal digit being the numerator of the fraction.
A fraction with 11 as a denominator is a repeating 2-digit decimal with the two digits being 9 times the numerator of the fraction.
1/8 = 0.125, so any multiple of 1/8 is that multiple of 0.125.