Multiplying two 2 digit numbers difference of 3
1.Choose a 2-digit number.
2.Select a number either 3 smaller or 3 larger.
3.Add 1 to the smaller number, then square.
4.Subtract one from the smaller number.
5.Add this to the square.
Example:
1.If the first number is 27, choose 24 as the second number.
2.Add 1 to the smaller number: 24 + 1 = 25.
3.Square this number: 25 x 25 = 625.
4.Subtract one from the smaller number: 24 - 1 = 23.
5.Add this to the square: 625 + 23 = 648.
6.So 27 x24 = 648.
See the pattern?
1.If the first number is 34, choose 31 as the second number.
2.Add 1 to the smaller number: 31 + 1 = 32.
3.Square this number: 32 x 32 = 1024.
4.Subtract one from the smaller number: 31 - 1 = 30.
5.Add this to the square: 1024 + 30 = 1054.
6.So 34 x 31 = 1054.
Choose the second number that will give you the easier square, and use your square shortcuts.
Notes
Vedic Maths - Notes
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24. Squaring a 2 digit number ending in 5
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