1) page 14 : assertion that a x 0 = a = 0 x a is not correct, a x 0 = 0!

2) ‘test before’ is the same as ‘test after’. So, before class, it is very likely that students would NOT do well in the test. After the class activities, unless the teaching/learning activities are really BAD, the students should do better. These tests are NOT showing results of learning or instructions.

3) Please amend.