Assertion: gauss | /r/CapableOf | multiply this total
Facets:
value: by half the last number
type: OTHER
Source sentences:
text: Gauss could have used his method to add all the numbers from $1$ to any number - by pairing off the first number with the last, the second number with the second to last, and so on, he only had to multiply this total by half the last number, just one swift calculation.