approach in teaching place value and value in math

At the beginning of the day, i anticipate that my pupils learn immediately the lesson because they are participative and attentive to listen. Until late in the afternoon, I made a test about the lesson on place value and value of a number, I found out that my pupils never had the mastery of the lesson. Do you know what my reaction is? For tradition teacher, the temper is high with full of sarcastic words, to express the disappointment of the evaluation, but you know what I did? I twist the lesson, instead of disappointment I made another activity to let all my pupils interested and learn what the lesson is all about.
HOW IT GOES ALONG THE WAY........THE MASTERY OF THE LESSON.......
Based from the seating arrangement that I have which is squatting the floor.........I let them arrange themselves each group by row. Then, all groups are represented by a leader to check whether their works are correct. The exercises goes like this: the pupils will write the value of the underlined number, after checking the place value will follow ( but make sure that their is already mastery of the value is).
                                                 value                             place value
   451  263
   451  362
   451  326
  With these exercises, I let my pupils identify what is the value of the underlined number then the place value of the underlined number, one at a time, then the leader will check the answer one at a time. With the exercises given, the pupils then learn the value and the place value of the underlined number. Then, another exercises are given and goes like these:
   451  263
   451  326
   451  632
   632  451
   326  514
These exercises were given until all place value and the value reach up to the hundred thousands place. Then, I give another exercise and goes like these:
What is the value of 6?            What is the place value of 6?
These statements were given up to the hundred thousands place were asked.
At the end of the day, me and my pupils never realized that the bell rings for flag retreat because the whole class really enjoyed. Me, too, as their teacher completed my day that my slow learners end up the session fruitfully.
I never realized that the approach am using is fitted for them because it just happen. That's why as a teacher, flexibility should always be ready so that our learners will appreciate what they have to learn for that day.
Hope that this approach be also applicable to your pupils.