Answer: Knowledge points: The methods for calculating squares are as follows: (1) the number of layers, which is the simplest method, in which those that are not laminated by the upper layer are completely exposed, from top to bottom are the first layer, the second layer, the third layer and the fourth layer respectively; (2) the number of rows. So when you encounter the problem of counting squares in the future, remember A, one layer at a time. B, the hidden squares should be counted.

1. The two piles of squares on the left are put together, which one is on the right? Connect with wires.

In the other group, the pile on the right is one more than the two piles on the left, so there is only one group corresponding, that is, it has been connected with arrows.

2. The picture below is made up of cubes. How many cubes are there?

Answer: Number of layers from top to bottom: The first layer has three cubes.

The second and third floors are equal, 3 more than the first floor, so each floor has 3+3= 6.

The three layers add up to 6+6+3= 15 cubes.

3. Count, how many small squares are there in the picture?

Answer: Number of layers from top to bottom: The first layer has six cubes.

The second floor is 6 more than the first floor, so there is 6+6= 12.

The two floors add up to 6+ 12= 18 cube.

4. Make the picture with small squares and count how many there are.

Answer: (1) 1+3= 4 (pieces)

(2) 1+2+5= 8 (pieces)

(3) 4+5= 9 (piece)

(4) 2+4+6= 12 (pieces)

5. How many small pieces of wood does the toy sofa below need to be folded?

Answer: This toy sofa is layered from top to bottom: there are three cubes on the first floor.

The second floor is 4 more than the first floor, so there is 3+4= 7.

The third floor is 3 more than the second floor, so there is 7+3= 10.

Three layers add up to 3+7+ 10= 20 small wooden blocks.