Tricks in mathematics
Download as PPTX, PDF1 like1,648 views
This document outlines different mathematical tricks for squaring numbers and multiplying numbers that differ by 2. It provides step-by-step instructions for squaring numbers using a special trick that involves adding and multiplying digits. Another squaring trick uses multiplying techniques by dividing the number in half, squaring the result, and multiplying by 4. For multiplying two numbers that differ by 2, it instructs the reader to take the middle number between them, square it, and subtract 1 from the result.
Tricks in mathematics
- 2. Contents Squaring Methods: o Using special trick o Using multiplying trick Simple Multiplication Between Numbers differing by 2
- 3. Squaring Tricks- Special Trick Step1:Take a number.For example , take number 29;write like this: 29 x29
- 4. Step 2: Add ones digit of the lower Number to the upper 2 digits.
- 5. Step3: Multiply tens digit of the lower number to the product got. 38 x 2 76
- 6. Step3:Now,multiply 10 to the new result so formed. 76 x 10 760
- 7. Step4:Now,multiply ones digit of the lower number to ones digit of the upper number and keep aside the previous product. Add the numbers.
- 8. Step5: the result is 841. Using Multiplying technique 1.Take a number,e.g, 196. 2.Divide the number by 2.(98) 3.Find the square of this number using the previous trick. 4.Then,multiply the square number by 4
- 10. 5.The answer is 38416 . Multiplication of 2 numbers differing by 2(within 100) 1.take two numbers and multiply them , like 24 x 26. 2.Take the middle number i.e.,25. 3.Square 25 and subtract 1 from it. 4.(25x 25) – (1)=625-1