1. The following equation is wrong: 101 - 102 = 1
    Move one numeral to make it correct.
    Move one line to make it correct. 

Ans: Move the numeral 2 half a line up to achieve 101-10² = 1
Move one of the lines that makes the "=" over to the "-" to make: 101 = 102 - 1

2. Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Ans:

The boys start on opposite sides of the river.

tricky ques

1. What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Ans: A Decimal Point
5.9 satisfies the condition

2. In Hungry Horace's kitchen there were three tins. Each tin contained three delicious cakes:

One night Horace crept into the kitchen, opened the three tins, and ate three of the cakes.The surprising thing was, when Horace went back to bed, each tin still contained three cakes.
How did he do it? Were they REALLY magic cakes?

Ans:

Horace ate the cakes in the large tin, then he put the middle tin into the empty tin.So when Horace went back to bed, every tin contained three cakes again!

smart riddles

1.  2+3=8,
3+7=27,
4+5=32,
5+8=60,
6+7=72,
7+8=??

Solve it?  
Ans is 98.        
Explanation: 2*1+3*2=8,3*2+7*3=27,.....,7*6+8*7=98.



2. The below is a number puzzle. It should be read left to right, top to bottom.
1
1 1
2 1
1 2 1 1
1 1 1 2 2 1
? ? ? ? ? ?
? ? ? ? ? ? ? ?

Question 1: What is the next two rows of numbers?
Question 2: How was this reached?

Ans: 312211
         13112221
Explanation: 1 ->one '1' , This is written in digit in 2nd row
                                 11 ->two '1' , This is written in 3rd row and so on

There are 10 numbers: 21, 22, 34, 39, 44, 45, 65, 76, 133, and 153. Can you split all the numbers into 2 groups so that the product of all the numbers of these 2 groups are the same? Ans:

The easiest way is to factor all the number out. 21 = 3 x 7, 22 = 2 x 11, 34 = 2 x 17, 39 = 3 x 13, 44 = 2 x 11, 45 = 3 x 3 5, 65 = 5 x 13, 76 = 2 x 2 x 19, 133 = 7 x 19. Then you can try to split the numbers. For example, 133 and 76 should be separated because both of them have factors of 19. These 2 groups are: (76, 21, 65, 22, 153) and (133, 39, 45, 44, 34).