The students never know if in addition a positive decimal using the same criteria are applied to positive integer digit that is in the same position or placement and add the phae.
I know that students in positive places to be positive using the same criteria for a positive integer is held in the main Elkodd or pound plate, then add up the same.
The students used to know that in addition to decimal is used the same additive จำนวนเต็มบวกคือ arrange positivity criteria digit in main or in the same แผน่ and positive.