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## [Speed Math] MULTIPLYING NUMBERS WITH LAST DIGIT SUM 100

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS WITH LAST DIGIT SUM 100: (Mul) S100dx 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 last 2 digits of the multiplier and multiplicand = 100 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 2 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_U4dGjQeWbKatvLKqT8L5HYJmp3sZ”] Download Practice sheet for MULTIPLYING NUMBERS WITH LAST DIGIT SUM 100

### Notes –

1. The RHS of the answer should always be written in 4-digit form by prefixing zero(s), if the value is less than 4-digit, e.g. write ‘9’ as ‘0009’ or ’21 as ‘0021’ or ‘121’ as ‘0121’.

### Related Shortcuts –

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## [Math Refresh] THE ULTIMATE GUIDE TO NUMBER CLASSIFICATION

We have been using numbers in everyday life. Everything from 0 to 22/7 might sound the same to most, but numbers differ from one another. Based on their characteristics, they are classified in groups. Based on all the different types of numbers Mathematician’s have named, we have built the ultimate guide to Number classification.

The associated chart shows how the number groups are related to each other. Read below for more details on each number group.

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## [Math Refresh] THE ULTIMATE COLLECTION OF EVERY KNOWN TESTS OF DIVISIBILITY

As a part of any math exam like GMAT, GRE or CAT, if you are trying to find out whether that number is evenly divisible without actually dividing it, then use these tests of divisibility. Learn these tests and save yourself precious time.