1999Math brain teasers require computations to solve.
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.
What Next?
Tweet
See another brain teaser just like this one... Or, just get a random brain teaser If you become a registered user you can vote on this brain teaser, keep track of which ones you have seen, and even make your own. Back to Top |
