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TRICKS WITH NUMBERS

12 CDs for the Price of 1!

Here are some tricks with numbers. these are given to intrigue you while providing pratice in the basic operations. try to find out how they are made up. make up new tricks for yourself.

Note: In items 1 to 6, each operation is to apply to the result of the operation already done.

a. mystery of mysteries

1. Think of a number

Add 3

Multiply by 2

Subtract 4

Divide by 2

Subtract the number thought of

The answer is, 1.

 

2. Think of a number

Add7

Multiply by 50

Subtract 184

Multiply by 20

Subtract 320

Divide by 1000

Subtract the number thought of

The answer is, 3.

                                     

                                        3. Think of a number

                                           add 7

                                           multiply by 13

                                           subtract 11

                                           multiply by 17

                                           subtract 255

                                          divide by 221

                                          subtract the number thought of

                                          the answer is 5.

 

CONTINUE..