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Friday, 16 December 2016

Maths - Brain Teasers

1.  What is the missing number ?


















Clue - start with the number 1.

Answer is (C).

2. A bit more difficult.




















Clue - use addition and multiplication


Answer is 16


3.  This one is difficult.















Clue - sequential

Should the correct answer be 70 or 80 ?


4. This should be easy.












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