Children always don't know what kind of situation to add and what kind of situation to subtract.

At this time, parents need to help their children understand, so they need to draw pictures.

Even if you draw a picture, the child may not meet the same problem next time.

So don't worry, wait until the second grade, this kind of problem is very simple for them.

First, let's see what happens, plus one.

The problem of adding one is this. For example, the children are in a row of Xiaoming, with three people in front and four people in the back asking you. How many children are there in this row?

So you need to use 3+4+ 1, and this is Xiao Ming, because there are no three people in front, including Xiao Ming, so when calculating the total number of people, Xiao Ming should be included.

The situation of subtracting one is like this.

The children in the first row are counted from the front, the third row and the fourth row behind. How many children are there?

This situation requires 3+4- 1=6 people.

Because Xiao Ming counted from the front and from the back, there are two Xiao Ming to cut in 3+4, and one Xiao Ming is six people.