1) Add together 2) Add up 3) Bring to a total 4) Count 5) Determine the sum of 6) Enumerate 7) Number 8) Numerate 9) Perform a summation 10) Sum up 11) Tally 12) To add together 13) To sum up, summarise 14) To sum, add up 15) Tot up 16) Total 17) Tote up Found on https://www.crosswordclues.com/clue/summate