[Speed Math] MULTIPLYING NUMBERS WITH LAST DIGIT SUM 10

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS WITH LAST DIGIT SUM 10: (Mul) S10dx from the MULTIPLICATION category.

When can I use this method?

For multiplying any 2-digit number with another 2-digit number such that the sum of the last digits of the multiplier and multiplicand = 10 and the remaining digits of multiplier are same as that of the multiplicand.

For multiplying any 3-digit number with another 3-digit number such that the sum of the last digits of the multiplier and multiplicand = 10 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 2-digit number with a 3-digit number.

 

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Download Practice sheet for MULTIPLYING NUMBERS WITH LAST DIGIT SUM 10

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Notes –

1. The RHS of the answer should always be written in 2-digit form by prefixing a zero, if the value is single digit, e.g. write ‘9’ as ‘09’.

Related Shortcuts –

Multiplying Numbers with last digit sum 100: (Mul) S100dx
Multiplying Numbers with last digit sum 1000: (Mul) S1000dx

 

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