When multiplying numbers, sometimes the average method is quite useful to determine their product.

**Vedic Sutra: ***Vyastisamastih (Specific and General)*

The rule is very simple: square the average of 2 numbers and subtract the square of the difference of average from either number.

Let us understand this with an example:

**41 x 39 = ?**

Average of 41 and 39 is 40.

So, answer = ((41+39)/2)^2 – (41-40)^2 = 40^2 – 1^2 = 1600 – 1 =1599.

Another example:

**32 x 28 = ?**

This method can be applied across various products. Let us practice more:

a 69 × 71 b 37 × 43 c 87 × 93

d 24 × 26 e 85 × 65 f 75 × 95

g 133 × 147 h 91 × 99

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