1, borrowed 28 books and bought back 6 books, which is equivalent to 28-6 comics missing from the library, that is, 22 comics missing.

2. It turns out to be the same, except that there are 22 fewer comics, 22 fewer comics than storybooks, or 22 more storybooks than comics.

3, this question is actually 28-6=22 to calculate, the formula is very simple, the key is to explain the logical relationship to children.

4. Actually, I think the questions in the first and second grades of primary school are still difficult. A little premature or overexploited.