Mark the numbers layer by layer first (that is, which layer to mark). Draw horizontal lines on each floor, and draw vertical lines for odd and even numbers.

The rules for drawing vertical lines (1, 3, 5 ... are the same as brick joints; 2, 4, 6 ... Brick joint). After drawing the vertical line, mark the serial number on the added bricks.

Method 2:

First, let the children know how many pieces are there on the first floor? (5 pieces per floor are known).

Second, subtract the number of blocks seen on each floor from the five blocks.

(5-4= 1)(5-2=3)(5-3=2 ) (5-3=2 )。

Therefore, 1+3+2+2=8 (number of blocks) is the number of missing blocks. Find the layer that doesn't need mending first, and count how many bricks there are in a * * *. Then take a look, each floor is missing a few pieces, just add them together.