5000 Difficult Numbrex Puzzles to Improve Your IQ

Solving NUMBREX puzzles guarantees to put your brain in top operating condition. NUMBREX puzzles challenge your mind two ways. First translate the result of an addition, subtraction, multiplication or division to decimal from binary, hexadecimal or roman numeral number formats. Second calculate the missing second operand in the arithmetic operation.

NUMBREX & SOLUTION

2952. 53 - ____ = 10000
2953. 7
• ____ = LXXXIV
2954. 12