TRICKS WITH NUMBERS
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 mysteries1. 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..