Pictured above, it is a type of primary school mathematics topic, including addition, subtraction, multiplication and division, with clear steps, just like "big hands holding small hands".

Solutions to such problems:

Question 1: From top to bottom, 45-37=8, 8÷2=4.

Question 2: From bottom to top, 42 ÷ 6 = 7,7+9 =16.

Question 3: From top to bottom, 7x8=56, 92-56=36.