I am not sure whether you can learn them in a single day. In any case, you just have to repeat them over and over again, until you memorize them.
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Its the same as your 2 time tables but you miss the middle one 2,6,8,10,12,14,16,18,20,22,24, 4,8,12,16,20,24
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.
There are a number of ways one can learn subtraction. Perhaps the best way is to find one that can spend some time teaching one subtraction. There are a number of workbooks also available.
Per day means everyday in one time
by making fine time tables and by following them one can score good marks in cbse board exams