For multiplying any 2-digit number with another 2-digit number such
that the last digit of the multiplier and multiplicand is = 5. The first
digits can be different.

For multiplying any 3-digit number with another 3-digit number such
that the last digit of the multiplier and multiplicand is = 5. The
initial 2 digits can be different.

You can also use this method to multiply numbers with unequal number
of digits, i.e. multiplying a 2-digit number with a 3-digit number such
that the last digit of the multiplier and multiplicand is = 5.

As long as finding the product of initial digits is easy enough, one can use this method to multiply numbers bigger than 2 or 3-digits.

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