Mathematics is often perceived as a challenging and daunting subject, but hidden beneath its complex surface lies a world of intriguing tricks and shortcuts that can make the subject not only manageable but also downright enjoyable. In this article, we will explore some fascinating math tricks that not only showcase the beauty of numbers but also demonstrate the clever techniques that can be employed to simplify complex calculations. In short, we love maths made easy!
Top 5 Best Math Tricks
- Multiplying by 11: The Elevens Magic
Multiplying any two-digit number by 11 might seem like a formidable task, but fear not – there’s a simple trick to make this process a breeze. Take, for instance, the multiplication of 23 by 11. Place the two digits of the original number with a space in between (2 _ 3) and add the two digits together (2 + 3). The result becomes the middle digit of the product, giving you the answer: 23 multiplied by 11 equals 253.
- The 9-Table Finger Trick
Multiplying any number by 9 might seem like a daunting task, but with the 9-table finger trick, you can impressively find the answer in no time. Extend your hands and number your fingers from left to right as 1 through 10. To find the product of, for example, 9 multiplied by 7, fold down the seventh finger. The result is two groups of fingers on the left (6) and three on the right (3), giving you the answer: 9 multiplied by 7 equals 63.
- The Power of 9: Digital Root Trick
The digital root of a number is the sum of its digits until a single-digit number is obtained. Surprisingly, the digital root of any multiple of 9 is always 9. Try it yourself – add up the digits of any multiple of 9, and you’ll find that the result is 9 or a multiple of 9.
- Squaring Two-Digit Numbers Ending in 5
Squaring two-digit numbers ending in 5 is remarkably simple. Take, for example, 35 squared. Multiply the first digit by itself plus 1 (3 * 4) to get the first part of the answer, and then append 25 to the result. In this case, 35 squared equals 1225.
- The Rule of 72 in Compound Interest
While not a mental math trick per se, the Rule of 72 is a handy shortcut in financial mathematics. To estimate how long it takes for an investment to double at a fixed annual rate of interest, divide 72 by the interest rate. For example, if the interest rate is 8%, it would take approximately 9 years for an investment to double (72/8 = 9).
Conclusion
Mathematics need not be a source of dread; it can be a playground of intriguing tricks and shortcuts that make even the most complex calculations enjoyable. These math tricks not only showcase the beauty of numbers but also serve as a testament to the creativity and ingenuity inherent in the world of mathematics.
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