Objective: To investigate students' mastery of basic calculation methods, and emphasize the calculation with the first two numbers and the third number.

Answer: 7, 108, 65, 97, 3

Analysis: Help students recall the calculation methods of addition, subtraction, multiplication and division and master them skillfully. Pay attention to the addition and subtraction of different lines.

Second, look at the picture format.

Objective: To investigate students' ability to read pictures and understand the meaning of mixed operations of addition, subtraction, multiplication and division, and their ability to correctly use two-step formulas to express specific problem situations.

Answer: 8-3+2 = 7 3+2+1= 6 7-3+5 = 910-3-2 = 5.

Analysis: Through specific situations, deepen students' understanding of the meaning of mixed calculation of addition, subtraction, multiplication and division, and consolidate the calculation method. It is difficult for freshmen to determine what the whole is in the process of understanding the meaning of the picture. 1 Figure and the third figure pay attention to guiding students to understand the meanings of "8" and "7" given by the formula, and the fourth figure pays attention to guiding students to find out that there are 10 apples.

Third, oral calculation.

4+4- 1= 6+3-5= 8-2-3= 3+3+4= 10-2-0= 9-5+3=

3+2+4= 6-4+5= 9-4-2= 7-7+8= 5+0+4= 2+5-3=

The purpose of the exam is to examine students' computing ability.

Answer: 7 4 3 10 8 7

9 7 3 8 9 4

Analysis: Cultivate students' ability to examine questions carefully, see the operation symbols clearly and calculate correctly. Note 1: According to students' different situations, instruct students to write the numbers calculated in the first step according to their actual needs. Note 2: Pay attention to students' calculation, take the mistakes in students' calculation as the material, guide students to analyze and reason, and consolidate the calculation method.

Fourth, fill in the appropriate operation symbols.

4+32=9 10-55= 10

4+32=5 10-55=0

Objective: To investigate students' observation ability and calculation ability.

Answer:++

- -

Analysis: The two questions in each group have similarities and differences. By guiding students to observe and find out, fill in the appropriate operation symbols according to different calculation results, so that students can truly understand the role of operation symbols in calculation, and guide students to pay attention not only to numbers but also to operation symbols in the calculation process.

Verb (abbreviation of verb) fill in ">"

8+2- 17 1+6-44 9-3+ 17 6+4-99 6+A-A9

Objective: To compare and examine students' computing ability and understanding of logarithm.

Answer: > < =