Trick 1: Birthday Calculation
Step 1: Add 18 to your birth month.
Step 2: Multiply by 25.
Step 3: Subtract 333.
Step 4: Multiply by 8.
Step 5: Subtract 554.
Step 6: Divide by 2.
Step 7: Add your birth date.
Step 8: Multiply by 5.
Step 9: Add 692.
Step10: Multiply by 20.
Step11: Add only the last two digits of your birth year.
Step12: Subtract 32940 to get your birthday!
Example: If the
answer is 122189 means that you were born on December 21, 1989.
Trick 2: Any Number
Step 1: Think of any number.
Step 2: Subtract the number you have thought with 1.
Step 3: Multiply the result with 3.
Step 4: Add 12 with the result.
Step 5: Divide the answer by 3.
Step 6: Add 5 with the answer.
Step 7: Take away the number you have thought from the
answer, that is, subtract the answer from the number you have thought.
Answer: 8
Trick 3: 1089
Step 1: Think of a 3 digit number.
Step 2: Arrange the number in descending order.
Step 3: Reverse the number and subtract it with the result.
Step 4: Remember it and reverse the answer mentally.
Step 5: Add it with the result, you have got.
Answer: 1089
Trick 4:
Multiplication of 11 with any number of 2 digits
Example 1 : 25*11=2…(2+5)…5=275
Example 2: 55*11=5…(5+5-10)…5=5(0)5=Add
1 is(5+1)…(0)…(5)=605
Example 3: 59*11=5…(5+9-10)…9=5(4)5=Add
1 is(5+1)...(4)…(5)=649
Trick 5:
Multiplication of 5 with any number
Example 1 : 25*5=Add 0 after 25 is 250/2 =125
Example 2: 55*5=Add 0
after 55 is 550/2=275
Example 3: 755*5=Add
0 after 755 is 7550/2=3775
Trick 6: Any three
digit Number
Step 1: Add 7 to it.
Step 2: Multiply the number with 2.
Step 3: subtract 4 with the result.
Step 4: Divide the result by 2.
Step 5: Subtract it from the number started with.
Answer: 5
Trick 7 :
Multiplication of 9 with any number
Example 1: 15*9=15(10-1)=15*10-15=150-15=135
Example 2: 155*9=155(10-1)=155*10-155=1550-155=1395
Trick 8: Think the number
between 1 to 10
Step 1: Ask a friend to think of a number between 1 and 10.
Example: 7
Step 2: Get them to double it.
Example: 14
Step 3: Ask them to add 10 to the answer.
Example: 24
Step 4: Then get them to divide by 2.
Example: 12
Step 5: Ask them to tell you what number they now have.
Example: 12
Step 6: You subtract 5 from this and tell them what their
original number was.
Example: 12 - 5 = 7
Answer : 7
Trick 9: Squares
1² = 1 = 1
2² = 4 = 1+3
3² = 9 = 1+3+5
4² = 16 =
1+3+5+7
5² = 25 =
1+3+5+7+9
6² = 36 =
1+3+5+7+9+11
7² = 49 =
1+3+5+7+9+11+13
8² = 64 = 1+3+5+7+9+11+13+15
9² = 81 = 1+3+5+7+9+11+13+15+17
10² = 100 =
1+3+5+7+9+11+13+15+17+19
Example: 123
= 1248
48
Answer : = 1728
Trick 10: Phone
Number Trick
Step 1: Take a calculator.
Step 2: Key in the first three digit of your 7-digit phone
number
Step 3: Multiply by 80
Step 4: Add 1
Step 5: Multiply by 250
Step 6: Add the last 4 digits of your phone number
Step 7: Add the last 4 digits of your phone number again
Step 8: Subtract 250
Step 9: Divide number 2
What you have is your phone number…..
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