18. Let me show you why:
If I have 1 set of 9, I have 9
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2 sets of 9 makes 18
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You can multiply 2 and 9 to get 18. Alternatively, you can multiply 3 and 6 to get 18 as well.
If you multiply 2*9, you get 18. Multiply that by 10 to get a three digit number, and you get 180.
How about: 2*4.5 = 9 or 4*2.25 = 9
You can make 24 using the numbers 2, 2, 9, and 6 by the following calculation: (9 - 6) × 2 × 2. First, subtract 6 from 9 to get 3, then multiply that by 2 to get 6, and finally multiply by the other 2 to reach 24.
Multiply by 10/9 = 1.111...