Notice that the outside is up to 12x, as in the old fashion of learning “times tables”.
Notice that 10x is not included, its just too easy.
Notice that the inside has 2x to 8x, so the class has not yet rote learn the 9x, 11x or 12x…
What is wrong with doing the times tables in order ? you could just do it by ADDITION. If you were doing 7 times tables… the last one was 42 ? the next one is 49… because that is 7 more…
To be sure you know the times tables… have at least one of the two numbers in some mixed up (as if random ) order.
The teacher could use the blackboard for verbal or written excercise …