Find rational number addition and subtraction exercises in grade one.

Test paper and answer for synchronous exercise of rational number addition and subtraction in the first volume of junior one mathematics.

1. The temperature was 5℃ in the morning and increased by 3℃ at noon. In the afternoon, due to the cold air heading south, it dropped by 9℃ at night, so the temperature at night was℃.

2. Write the answer directly (1)(-2.8)+(+ 1.9)=, (2) =,

(3) ,(4)

3. Given the sum of two numbers, the sum of antonyms of these two numbers is.

4. Change the subtraction in to addition, and write it as an algebraic sum with the plus sign omitted.

5. It is known to be the reciprocal of 6, and if it is less than the reciprocal of 2, it is equal to.

6. Insert three numbers between-13 and 23, so that the distance between every two adjacent numbers in these five numbers is equal, then the sum of these three numbers is.

7. Xiaoming accidentally dropped the ink on the axis when he was doing his homework. According to the numerical values in the figure, determine that the sum of the integers covered by ink is.

–6 –4 –3 –2 1 0 1 2 4 5 6

Second, choose:

8. In the position deformation of the following exchange addend, the correct one is ().

a，B，C，D，9。 In the following calculation results, 3 is ().

A. BC 10 year. The following statement is correct ().

A. the difference between two numbers must be less than the minuend B. If you subtract a negative number, the difference must be greater than the minuend.

C. MINUS a positive number, the difference must be greater than the minuend D. 0 MINUS any number, and the difference is negative.

1 1. The school, home and bookstore are located in a north-south street in turn, with the school home 20 meters south and the bookstore home 0/00 meters north. Zhang Ming starts from home, walks 50 meters north, and then walks -70 meters north. At this time, Zhang Ming's position is

A. At home B. At school C. At the bookstore D. Not in the above places.

12, the number of trains on the train ticket has two meanings. First, the smaller the number, the faster the speed. 1 ~ 98 is an express train,10/~198 is a through train, and 30 1 ~ 398 is a local train. Secondly, odd numbers and even numbers indicate different driving directions, where odd numbers indicate starting from Beijing and even numbers indicate heading for Beijing. According to the above regulations, the number of express trains from Hangzhou to Beijing may be ().

20(B) 1 19(C) 120(D)3 19

13. Calculation:

①- +(+ ) ②90-(-3)

③-0.5-(-3 )+2.75-(+7 ) ④

⑤ ⑥

14. A maintenance team takes a bus along the highway maintenance line, and the agreed forward direction is positive and the backward direction is negative. On a certain day, the route (in km) from O to the end of work is+10, -3, -4, -2, -8,-13, -2,.

(1) How far is it from O when we call it a day?

(2) If the fuel consumption is 0.2 liters per kilometer, how many liters will be consumed from O to work?

15. The owner of a shopping mall recorded the monthly profits in the first half of this year as follows: in June, February, May and June, the profits were130,000 yuan,120,000 yuan,1250,000 yuan and100,000 yuan respectively, and the losses were in March and April. Use positive and negative numbers to express monthly profit and calculate the total profit of shopping malls in the first half of the year.

Answer:

1:- 1

2:-0.9, 4, 12. 19, 5

3: 17/6

4:6-3+7-2

5:- 10

6: 15

7:- 10

8:D

9:B

10:B

1 1:B