Do Vedic Math Shortcut Multiplication
Vedic Math can be used to multiply large numbers in a matter of seconds without using a calculator! Here are some quick examples of how you can use this technique.
Contents
Steps
Two-Digit Numbers
- Write the two digit numbers next to each other as so:
- 97 x 93
- Note: This example is for two-digit numbers that start with the same number and have second digits that equal 10 when added together (in this example, both numbers start with 9 and the second digits, 7 and 3, have a sum of 10).
- First, we multiply the two second digits together. In this case that would be:
- 7 x 3 = 21
- Place this result to the right-hand side of the final answer.
- Here you can see that the final answer will look like xx21
- Now add 1 to the first digit of the first number:
- 9 + 1 = 10
- Multiply 10 by the first digit of the second number:
- 10 x 9 = 90
- Place this result on the left-hand side of the final answer, and you'll see that you have quickly calculated the correct answer to the original problem.
- 9021
Two-Digit Numbers Alternate Method
- Take another set of two-digit numbers to be multiplied. Keep in mind that the first digits are the same and the sum of the second digits equals 10.
- 98 x 92
- Above each number, right the difference, or how deficient each of the numbers is from 100.
- 98 is -2 from 100, so write -2 above 98
- 92 is -8 from 100, so write -8 above 92
- Cross-subtract these numbers from the value on the other side of the multiplication sign. You will see that it results in the same number.
- 98 - 8 = 90
- 92 - 2 = 90
- Place this number to the left-hand side of the final answer
- Now you can see that the final answer will look like 90xx
- Multiply the two differences together.
- -2 x -8 = 16
- Place this number to the right-hand side of the final answer, and again see that you have quickly calculated the correct answer to the original problem.
- 9016
Three Digit Numbers
- Take the two three-digit numbers to be multiplied and write as so:
- 104 x 103
- Now that we are above 100, right down how much higher each number is from 100.
- 104 is +4 from 100, so write +4 above 104
- 103 is +3 from 100, so write +3 above 103
- Cross-add these numbers from the value on the other side of the multiplication sign. You will see that it results in the same number.
- 104 + 3 = 107
- 103 + 4 = 107
- Place this number to the left-hand side of the final answer
- Now you can see that the final answer will look like 107xx
- Multiply the two differences together.
- 4 x 3 = 12
- Place this number to the right-hand side of the final answer, and even here you'll be able see that you have quickly calculated the correct answer.
- 10712
Tips
- Although this is a handy method to do some quick multiplication, make sure you know exactly what you're doing before abandoning your calculator. If you have one, it couldn't hurt to check your answer.
