Likewise you can find out square of a number that is one less than the number whose square is known
Let me show it by taking an example:
Then 592 will be given by the following
592 = 602 - (60 + 59) = 3600 - 119 = 3481
or Say you know 252 = 625 then
242 = 625 - (25 + 24) = 576
Apply it to find square of a digit, which is one, less than the square of known digit. This works very well for the complete range of numbers.
In this I have utilized the Base Technique of Vedic Maths. You can use this technique to find the square of anumber which is one less than the square of a known number.
Notes
Vedic Maths - Notes
2. Squaring a 2 digit number beginning with 1
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5. Multiplying two 2 digit numbers difference of 6
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6. Simple trick to remember table of 19
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8. Multiplying two 2 digit numbers difference of 4
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11. Square 2 Digit Number with up down Method
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12. Multiply any two digit number with 11
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14. Multiplying two 2 digit numbers difference of 3
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15. Squaring a 2 digit number ending in 2
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16. Squaring a 2 digit number ending in 4
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17. find square of a number between 50 and 60
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18. Multiplying two selected 3 digit numbers middle digit 1
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19. Likewise you can find out square of a number that is one less than the number whose square is known
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24. Squaring a 2 digit number ending in 3
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26. Digital Sums For Multiplication By Eleven
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27. Lets add 1 hr and 35 minutes and 3 hr 55 minutes together
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28. Vertically and Crosswise To find 26 Multiplied by 31 in One Line we need to look at a Pattern
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29. Squaring a 2digit number ending in 8
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32. Multiplying two selected 3 digit numbers middle digit 0
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33. Convert Fahrenheit to Celsius and vice versa
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35. Multiplying two 2 digit numbers difference of 8
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36. Multiplying two 2 digit numbers difference of 10
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38. Multiply any two numbers from 11 to 20 in your head Take 15 x 13
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39. Squaring a 2 digit number ending in 5
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40. The Squaring of Numbers Ending in 5
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41. Squaring a 2 digit number beginning with 9
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42. This little math trick will show you whether a number is divisible by four or not
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43. Squaring a 2 digit number ending in 9
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45. Squaring a 2 digit number ending in 1
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46. Multiplication of two numbers around 100 is even easier than you could ever imagine
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47. Multiplying two 2 digit numbers difference of 2
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48. How to multiply 123 and 321 in one go
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49. Squaring a 2 digit number ending in 6
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