Children are easily confused by the "big" and "small" in the question. When they see "big", they will fill in a larger number, and when they see "small", they will fill in a smaller number. Wrong, 50 is larger than (5 1) 1 and smaller than (49) 1. Solution to the problem: When solving this kind of problem, you can cover up the parts behind "big" and "small", such as "50 is 1 greater than ()", and cover up "1" after "big" as "50 is greater than ()" to find out who is comparing with whom. You can also write it down first: 49, 50, 5 1. 50 is larger than the number before it 1 and smaller than the number after it 1. Problem solving process: 50 is larger than (49) 1 and smaller than (5 1) 1. Variant correction: 30 is larger than () 1 and smaller than () 1. () is larger than 80 1, and () is smaller than 80 1.
□-□=□-□=□-□= 1
Method Guidance: Let students know the meaning of "=" first, that is, regard □-□ as a whole, and draw a horizontal line below it to show emphasis. All such integers are equal to 1. Then let the students think □-□ = 1. After the final completion, they can read to deepen their understanding of the whole -5-4 = 1, 3-2= 1 and so on. Error-prone question 2: □●○★☆■ (1) From the left, □ is the () th and () is the fifth. (2) ? Is the first, χ is (), and the sixth is ().