misenumerate

Meanings

verbmisenumerate (third-person singular simple present misenumerates, present participle misenumerating, simple past and past participle misenumerated)

present singular third person misenumerates · participle present misenumerating · participle past misenumerated · past misenumerated

To enumerate incorrectly; miscount.
Prior to 1881, the census listed significant numbers of children at home. While some of these children were misenumerated, many performed domestic work to ease the burden on the mother.
2016, Karl Ittmann, Work, Gender and Family in Victorian England, page 200
2 more examples
To avoid tedious repetitious ^([sic]) the possibility that at least some of those “recovered/omitted” were not altogether “nonenumerated in 1951/1961”, but may have been misenumerated in the wrong age groups is not repeated at every relevant point.
1963, Pakistan Development Review
For the word problem above, for example, a child may have difficulty representing the minuend accurately (put up four fingers or put out four blocks instead of five), take away one object too many or too few, or misenumerate the remaining objects.
1989, Arthur J. Baroody, A Guide to Teaching Mathematics in the Primary Grades, page 133