Teaching 1st grade will be different by teaching high school students. Required certain techniques so that the child can absorb lessons more fun considering the psychological child is still in the early learning stages.
The voice sounded clear enough by children, intonation, etc. are things that are very important to be possessed by the teacher. For early elementary grades, they are still considered early childhood, before providing early childhood learning, as teachers need to recognize the characteristics of elementary school age children first. Do not forget to always give something new and varied for them. No need expensive, objects in the environment can be the object of exploration for children.
The period is also very short of their concentration. Thus, teachers must have a second plan, and even third, fourth plan needs to be prepared for them so they do not saturate. Keep in mind that early childhood is a period play. Thus, the instruction given to them should be based on the principles of play (fun, children can explore, gain a lot of experience).
Children are not miniature adults but they have the characteristics and uniqueness of each. So, do not equate them with the high school kids that are easier on the set and was able to concentrate for a long time.