Two-digit multiplication of "mental arithmetic treasure"

Listen up, children:

The bits of a product are the product of two digits. The 10-bit is the sum of the two-digit cross-product, the high is the product of dozens of bits, and follows a full 10 forward one.

Formula: Product = (10-bit product) (multiplied by dozens of bits x multiplied by digits + multiplied by digits x by dozens of bits) (single-digit product)

Example: 23x16= (2x1) (2x6+3x1) (3x6) =3 6 8

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Two-digit multiplication of "mental arithmetic treasure"