A solution which is accessible with very basic arithmetic and minimal mental effort, is11 = 3/3 +3/3 +3/3 + ... + 3/3 (eleven times, using 22 threes),
12 = 3/3 +3/3 +3/3 + ... + 3/3 + 3/3 (twelve times, using 24 threes), and so on.
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if your using whole numbers, u can only use 3
1120 = 1.12x10^3
By using: (3*6)+(3*2) = 24
only using the numbers once
3! = 6.