The practice has been the subject of negative integers add 10 1000 series takes 12 hours of teaching skills can be additive to remove the integer 1000 of students grade 3 according to the set.
The skill of subtraction integer number 1000 10 series takes in 12 hours of instruction, which can develop positive skills. The minus whole of 1000, the third year students have set.
A practice addition, subtraction, the integer 1 000 10 series, takes in the teaching 12 hours. Which can develop skills, integer addition subtraction 1 000 of students, 3 as set.