The term "arithmetic operations" from basic grammar school mathematics is highly formal and technical in my ears. In my native Danish language it translates into:
The arithmetic operations = De aritmetiske operationer
I show this to tell that we do have the same technical wording in our language. But we also have another and much more nontechnical term to use in Danish for kids and colloquial conversations (so frequently used that it is not a colloquial term anymore but formally recognized):
De fire regnearter = The four calculation kinds / types --(direct translation)
See the Danish wiki. Before I was even old enough to understand words like "arithmetics" or "(mathematical) operations", I could easily understand and learn the four calculations kinds.
Also, the term "arithmetic operations" seems to be broader than the latter. Wikipedia describes it as addition, subtraction, multiplication and division as well as powers and roots. A term like "the four calculation kinds" clearly only covers the first four and thus the headline for math taught to small children at the early school stages.
I am therefore wondering: Is there similar informal term in English? An alternative to "arithmetic operations" that refers to those four basic means of calculation? What term do English speakers use when talking with kids in 1st-year grammar school?