1、78-27+ 18=69。

2、47+ 19-38=28。

3、46- 13+27=60。

4、76- 12+8=72。

5、36+27+26=89。

6、25+8+46=79。

7、55+ 17-67=5。

8、39- 19+36=56。

9、74- 12-27=35。

10、38- 16+ 17=39。

1 1、34+58- 17=75。

12、53+ 16- 18=5 1。

13、43-25+ 14=32。

14、36- 14+73=95。

15、 18- 17+44=45。

16、52+ 16- 12=56。

17、52-30- 1=2 1。

18、82- 12+36= 106。

Matters needing attention in continuous increase or decrease of secondary level

1. Understand the basic concepts: Make sure you have a clear understanding of the basic concepts of addition and subtraction. Addition is the addition of numbers and subtraction is the subtraction of numbers.

2. Master the order of numbers: For addition and subtraction, it is very important to understand the order of numbers. When adding, the order of numbers will not affect the final result; In subtraction, the order of numbers will affect the result.

3. Pay attention to carry and borrow: in the process of addition and subtraction, you may encounter the need to carry or borrow. When the addition result exceeds 9, it needs to be carried to a higher number of digits; When the subtraction result is negative, you need to borrow bits to complete the subtraction operation.

4. Pay attention to understanding the question: read the question carefully to ensure that you understand the meaning of the question. Especially for the problem of continuous subtraction, we should pay attention to the relationship between the minuend, subtraction and difference.

5. Standardize the writing and calculation process: in the process of addition and subtraction, we should pay attention to standardize the writing. Align the numbers and clearly mark carry and borrow to avoid mistakes.

6, do more exercises: through a lot of exercises, improve the proficiency of continuous addition and subtraction. You can use workbooks, worksheets or online learning resources to practice.