Type, for instance, "Four" and see that it equals the number of letters (=4).
"SquareRootOfNineHundredSixtyOne" (=31).
Or, "SquareRootOfTwelveHundredAndNintySix" (=36).
"OxygenAtomWeight"(=16).
"EnglishAlphabetHas?Letters"(=26).
"MyAgeIfNineYearsAgoIWasTwenty"(=29).
"ItsHalfIsSix"(=12).
"LastTwoDigitsOfYearWhenWorldWarTwoStarted"(=41).
"TheRunningOutCentury"(=20).
The Activity is best to play in a group, where some bring new ideas from various disciplines, others playfully fix them.
Stimulates LEARNING NEW CONCEPTS - just participate actively.