198+ 109=

134+ 150=

253+ 120=

190+ 156=

178+ 123=

240+ 100=

140+ 140=

120+ 125=

134+ 123=

Second, subtraction:

324- 156=

230- 190=

180- 1 10=

250-200=

398- 190=

278- 178=

450-220=

400- 199=

32 1-320=

159- 100=

123- 107=

Extended data:

Mathematics is one of the most important learning courses for primary school students. Learning mathematics can greatly improve children's logical thinking ability, so learning mathematics well can greatly promote the learning of other subjects.

Learning math well is not only for coping with exams, but for a better life. You know, in our daily life, mathematics brings a lot of convenience. In many cases, we can't carry out normal activities without mathematics.

Primary school is the beginning of mathematics learning, and the knowledge learned at this stage will not only be useful for life, but also lay the foundation for future study. Primary school math teachers often emphasize to parents that children whose grades are below the passing line.

If you want to improve your grades quickly, you need to work hard on basic knowledge. Only when the basic knowledge is firmly grasped can children move forward steadily and move towards a higher level.

In the process of learning mathematics, the most important thing is to master basic formula theorems and some mathematical concepts. Many children are prone to careless mistakes when doing problems, that is, they don't have a good grasp of basic knowledge, so they always stumble when doing problems and their grades have not improved.