Multiplying two 2 digit numbers difference of 4
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 63, choose 67 as the second number.
2.The middle number (the average) is 65.
3.Square this middle number: 65 x 65 = 4225. Remember how to square a 2-digit number ending in 5?
4.Subtract 4 from this square: 4225 - 4 = 4221.
5.So 63 x67 = 4221.
See the pattern?
1.If the first number is 38, choose 42 as the second number.
2.The middle number (the average) is 40.
3.Square this middle number: 40 x 40 = 1600.
4.Subtract 4 from this square: 1600 - 4 = 1596.
5.So 38 x 42 = 1596.
Choose the second number that will give you the easier square, and use your squareshortcuts.
Notes
Vedic Maths - Notes
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