Brain Teasers
1999
The year 1999 is special. Using the numbers 1, 9, 9 and 9, in that order, make the number 89. You may use brackets and any standard maths operation such as the square root, +, -, * and /. For example, 26 = -1 + 9 + 9 + 9.
Answer
89 = -1 + 9 + (9 * 9).Hide Answer Show Answer
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