Multiplying two 2 digit numbers difference of 8
1.Choose a 2-digit number.
2.Select a number either 8 smaller or 8 larger.
3.Find the middle number of the two (the average).
4.Square this middle number (multiply it by itself).
5.Subtract 16 from this square.
Example:
1.If the first number is 34, choose 26 as the second number (8 smaller).
2.The middle number (the average) is 30.
3.Square this middle number: 30 x 30 = 900.
4.Subtract 16 from this square: 900 - 16 = 884.
5.So 34 x26 = 884.
See the pattern?
1.If the first number is 64, choose 72 as the second number (8 larger).
2.The middle number (the average) is 68.
3.Square this middle number: 68 x 68 = 4624. Remember how to square a 2-digit number ending in 8?
4.Subtract 16 from this square: 4624 - 16 = 4608.
5.So 64 x 72 = 4608.
Choose the second number that will give you the easier square, and use your square shortcuts. Practice.
Notes
Vedic Maths - Notes
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