Assuming that English is not your first language, the question as I understand it is:
"How do I teach level 2 learners about addition using money?"
Try setting up a shop in the classroom. Have a display of (empty) boxes with prices attached. Give the pupils fake paper money (of different values) and ask, "If you bought that item, how much change would you expect? you could also ask, "If I worked on a paper round for six days, and I was paid two Rand (or the currency of your country) a day, what would I be paid at the end of the week?
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Multiplication is repeated addition.
A chemist works in a lab usually in a corporate lab or a hospital setting. They may teach classes as well in a college or high school level.
Schools maintain content validity by conducting reforms in the field of educational facilities and quality than teachers who teach at the school. In addition to the above the quality of the students themselves are also influential.
To teach at the college level (or at a private high school), a minimum of a master's degree in mathematics (or a closely related field) is required. Some colleges will allow teachers to teach as adjuncts (meaning they are not official professors, do not have offices, teach only a few classes, and make a much lower salary than official professors) if they are in the process of getting a master's degree. To teach at the high school level, the requirements vary from state to state in the US. Most require a bachelor's degree in mathematics education. The main difference is that colleges do not require any education background whatsoever (just math) while high schools require more education than math (in some districts with a shortage of teachers, a history teacher with no math background could be allowed to teach calculus).
Teach has one syllable.