Tricks of mathmagic

1. MATH MAGIC
GEOMETRY & CRAFTS
1st Secondary
Sagrada Familia P.J.O.

2. TRICK 1
Think of a number between 1 and 100.
Multiply your number by 4.
Add 12.
Multiply this number by 2.
Add 16.
Divide this number by 8.
Subtract your original number.

3. Your new
number is 5!

4. TRICK 2
Think of a number between 1 and 9.
Multiply your number by 10.
Add 9.
Subtract your original number.
¿Do you have a two digit number?
Cross out one of the two digits
(tachar)
Tell me the other digit

5. The number that is
crossed out is …!
El número que está
tachado es…!

6. TRICK 3
Choose a card
Give valour to the figures
1
10
9
8

7. -Multiply by 2 the number of your card.
-Add 1.
-Multiply now by 5.
-If your card is gold (oros), add 4.
-If your card is cups (copas), add 3.
-If your card is swords (espadas), add 2.
-If your card is clubs (bastos), add 1.
WHAT IS YOUR NUMBER?

8. TRICK 4
-Multiply the day of your birthday by 10.
-Add 7.
-Multiply by 2.
-Add 7 again.
-Multiply by 5.
-Add the month you was born.
(January 1, February 2, March 3…)
TELL ME YOUR RESULT

9. TRICK 5
-Think in a two-digit number.
-Add the two digits.
(44)
(4+4=8)
-Substract the result to the original number.
(44-8=36)
-Look at the next table the figure which corresponds
to the final number.
What number were you thinking?

10. TRICK 6
-Think of a three-digit number, but each digit different. (201)
-Change the first and last digits. (102)
-Substract both numbers. (201-102=099)
-Change the first and last digits of the new number. (990)
-Add both numbers (990+099)
WHAT IS YOUR RESULT?