Brain Teasers

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Riddle 1: Using only addition, add eight 8s to get the number 1,000.

888 + 88 + 8 + 8 + 8 = 1,000.

Riddle 4: What did one math book say to another?

I have so many problems.

Riddle 3: I add six to eleven, and get five. Why is this correct?

Think about the numbers on a clock. When it is 11 a.m., adding six hours makes it 5 p.m.

Riddle 2: One brother says of his younger brother: "Two years ago, I was three times as old as my brother was. In three years time, I will be twice as old as my brother." How old are they each now?

Two years ago, they were 15 and 5 respectively, and in three years, they will be 20 and 10.

Riddle 5: How do you go from 98 to 720 using just one letter?

add an "x" between "ninety" and "eight" (90 x 8 = 720)


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