Brain teaser – Make this equation true, 999999999999999 = 1990
Insert +, -, x or / in suitable places on the left side of = so as to make the equation true:
999999999999999 = 1990
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(9999-999)/9+999-9+9-9
(9999/9999)+999+999-9
999+999-9+(9999/9999)
YES.
999+999-9+(9/9)+999-999=1990
(9999/9)-(999/9)+(999-9)+(9-9)
Brackets don’t matter