Because certain times tables always end in particular numbers.
The numbers in the 10 times tables always end with a 0 e.g 10, 20, 30...
The number in the 5 times tables always end with a 0 or 5 e.g. 5, 10, 15...
The 2, 4, 6, 8 times tables will always end in even numbers.
The 1 times table is obvious.
The 9 times table always has digits that sum to 9 e.g. 9, 18, 27...
The hardest times table is usually considered to be the 7 times table to learn as their is no obvious pattern to the numbers.
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Learn your multiplication tables
There are many tricks to learning multiplication tables. One is the rhyme '8 times 8 fell on the floor and when it woke up it was 64'. Another is to know that all the nine multiplication tables add up to 9 up to 9 times 10.
While the multiplication tables are sometimes attributed to Pythagoras the oldest known multiplication tables were used by the Babylonians about 4000 years ago. These used a base of 60. The oldest known tables using a base of 10 are the Chinese decimal multiplication tables on bamboo strips dating to about 305 BC, during China's Warring States period.
Multiplication table has its origin from simple mathematical table.Mathematical tables can be traced backed to 1900 BC in the Babylonian mathematics in the clay tablets found one of the most important tablet is named as Plimpton322.Then the Greek Astronomer Hipparchus used Trignometric Tables those can be the multiplication table in some sense.Those may be the Greeks who developed multiplication tables on road around 200BC. Pythagoras.
Because he knew His Tables! :)