Mathematics is often seen as a challenging subject, but it’s also a realm filled with fascinating tricks and shortcuts that can make complex calculations seem like magic. These math tricks not only enhance your problem-solving skills but also make math more enjoyable and less intimidating. In this article, we’ll explore 10 mind-blowing math tricks that can help you impress your friends, speed up calculations, and develop a deeper appreciation for the beauty of mathematics.
- Multiplying by 11:
To quickly multiply a two-digit number by 11, split the two digits and insert their sum in between. For example, to multiply 32 by 11, add 3 and 2 to get 5, and place it between 3 and 2. The result is 352.
- Squaring Numbers Ending in 5:
To square a number ending in 5, simply multiply the number without the 5 by the next consecutive number and append 25 at the end. For example, to square 35, multiply 3 by 4 to get 12 and then add 25. The result is 1,225.
- The 9’s Trick:
To multiply any number by 9, use this simple trick. Hold out all your fingers. If you want to multiply 9 by, say, 7, fold down your 7th finger. You’ll have 6 fingers on one side and 3 on the other, giving you the answer: 63.
- The Rule of 72:
This is a handy trick to estimate the time it takes for an investment to double at a fixed annual rate. Divide 72 by the annual interest rate (as a percentage), and you’ll get the approximate number of years it takes for your money to double.
- The Magic of 9’s Multiplication:
When multiplying a number by 9, the digits in the product will always add up to 9 or a multiple of 9. For example, 9 times 7 equals 63 (6 + 3 = 9).
- Finding Percentage Quickly:
To find 1% of a number, move the decimal point two places to the left. To find 10%, simply remove one decimal place. For example, 1% of 450 is 4.5, and 10% is 45.
- The Power of the Number 9:
The sum of the digits of any multiple of 9 will always be 9 or a multiple of 9. Try it with numbers like 18, 27, or 99.
- The Multiples of 3:
To determine if a number is divisible by 3, add up its digits. If the sum is divisible by 3, then the original number is also divisible by 3. For example, 237 (2 + 3 + 7 = 12) is divisible by 3.
- Square of Any Number Ending in 6:
To find the square of any number ending in 6, take the last digit (6), multiply it by the next consecutive number (7), and append 36 at the end. For instance, 26 squared is 676.
- The Power of 2:
To quickly multiply a number by 2, simply double it. To multiply by 4, double it twice. This trick works for any power of 2, making calculations lightning-fast.
Conclusion:
Mathematics can be fun and exciting when you explore the numerous tricks and shortcuts it has to offer. These math tricks not only simplify calculations but also reveal the underlying beauty and elegance of mathematical concepts. By incorporating these tricks into your mathematical toolbox, you’ll gain a new appreciation for the subject and find that math can indeed be magical.
