Where does “rekenkunde” come from?

rekenkunde (Dutch) comes from Dutch rekenen, from Middle Dutch rēkenen, from Old Dutch rekanon, from Proto-Germanic rekanōną, from Proto-Indo-European h₃reǵ- — to straighten, to right oneself; right; just.

rekenkunde (Dutch): arithmetic

Definitions

arithmetic

Ancestry of “rekenkunde”, step by step

rekenkunde traces back through two separate lines of ancestry.

via Dutch rekenen

Step	Language	Word	Meaning
1	Dutch	rekenen	to calculate, to do arithmetic
2	Middle Dutch	rēkenen	to put in order (an account, bill etc)
3	Old Dutch	rekanon	—
4	Proto-Germanic	rekanōną	to count; to explain
5	Proto-Indo-European	h₃reǵ-	to straighten, to right oneself; right; just

via Dutch kunde

Step	Language	Word	Meaning
1	Dutch	kunde	skill, competency
2	Middle Dutch	conde	first/third-person singular past...
3	Old Dutch	kundi	—
4	Proto-Germanic	kundīn	—

Every word from Proto-Indo-European h₃reǵ- →Every word from Proto-Germanic rekanōną →Every word from Old Dutch rekanon →