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# [Speed Math] MULTIPLYING NUMBERS WITH FIRST DIGITS SUM 100

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS WITH FIRST DIGITS SUM 100 : (Mul) F100dx from the MULTIPLICATION category. ### When can I use this method?

For multiplying any 3-digit number with another 3-digit number such that the sum of the initial digits of the multiplier and multiplicand = 100 and the remaining digits of multiplier are same as that of the multiplicand.

For multiplying any 4-digit number with another 4-digit number such that the sum of the initial digits of the multiplier and multiplicand = 100 and the remaining digits of multiplier are same as that of the multiplicand.

You cannot use this method to multiply numbers with unequal number of digits, i.e. multiplying a 3-digit number with a 4-digit number.

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[tubepress mode=”playlist” playlistValue=”PLngU_U4dGjQcBKHCcZEPTSAtafu2cd3hV”] Download Practice sheet for MULTIPLYING NUMBERS WITH FIRST DIGITS SUM 100