Math Tricks
1.Multiplying by 6
If you multiply 6 by an even number, the answer will end with the same digit. The number in the ten's place will be half of the number in the one's place.
Example: 6 x 4 = 24.
2.The Answer Is 2
- Think of a number.
- Multiply it by 3.
- Add 6.
- Divide this number by 3.
- Subtract the number from Step 1 from the answer in Step 4.
The answer is 2.
3.Six Digits Become Three
- Take any three-digit number and write it twice to make a six-digit number. Examples include 371371 or 552552.
- Divide the number by 7.
- Divide it by 11.
- Divide it by 13.
The order in which you do the division is unimportant!
The answer is the three-digit number.
Examples: 371371 gives you 371 or 552552 gives you 552.
- A related trick is to take any three-digit number.
- Multiply it by 7, 11, and 13.
The result will be a six-digit number that repeats the three-digit number.
Example: 456 becomes 456456.
4.Memorizing Pi
5.Finger Multiplication Tables
Everyone knows you can count on your fingers. Did you realize you can use them for multiplication? A simple way to do the "9" multiplication table is to place both hands in front of you with fingers and thumbs extended. To multiply 9 by a number, fold down that number finger, counting from the left.
Examples: To multiply 9 by 5, fold down the fifth finger from the left. Count fingers on either side of the "fold" to get the answer. In this case, the answer is 45.
To multiply 9 times 6, fold down the sixth finger, giving an answer of 54.