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The secret to working out your 11 times tables from 10 to 99 is this: Separate the number like this: 11x45=495 4 5 Add the numbers together 11x45=495 4+5=9 Put the added number in between the first ones 495 And theirs your answer!
Logarithmic tables.
Rudolphine Tables was created in 1627.
To find the number of full tables, divide 138 by 12, Your answer will be the number of tables that are full. 138 divided by 12 equals 11 full tables with one having 6 people.